I. STATEMENT OF CASE
A decree dissolving the marriage of the appellant mother, Kathleen M. Brewer, ordered the father, Thomas E. Brewer, to make a monthly support payment for their minor daughter, Ashley JoAnne. As a result of the father’s subsequent death, the appellees, the father’s estate and testamentary trust, as the parties substituted in place of the father, seek to credit against their respective child support liabilities the benefits being paid *732 on behalf of the daughter under the provisions of the federal Social Security Act, 42 U.S.C. § 301 et seq. (1988 & Supp. Ill 1991). Following an evidential hearing, the district court so ordered. The mother assigns that ruling as her sole operative error. We affirm.
II. FACTS
The dissolution decree ordered the father to pay $500 per month in child support. This requirement was in accordance with the stipulated agreement of the mother and father, which was incorporated into the decree. The agreement recited it to be the intention of the dissolution parties that the agreement be a full, final, and complete settlement of all matters in dispute between them, and required the father to maintain a term policy of insurance on his life, payable to the daughter equal to the amount of child support which would have accrued through her 19th birthday. The agreement also required the father to maintain an otherwise undefined “health and accident insurance” policy on the daughter.
The father thereafter executed a will, which placed his assets in trust should he die before the daughter attained the age of majority. The trust requires that the trustee pay the court-ordered child support. The will provides for distribution of one-half of the total of the trust fund to the daughter when she reaches the age of 21 and disbursement of the balance upon her attaining age 25. Should the daughter die before distribution of all the assets, the assets are to be paid to a designated charity.
Although the father purchased two term life insurance policies, they were payable to the trust, not to the daughter. The record does not tell us whether the father did or did not provide a health and accident policy of any description for the daughter.
III. SCOPE OF REVIEW
Modification of child support is an issue entrusted to the discretion of the trial court, and although reviewed de novo on the record, the decision of the trial court will be affirmed absent an abuse of discretion.
Lodden
v.
Lodden,
A judicial abuse of discretion exists when a judge, within the
*733
effective limits of authorized judicial power, elects to act or refrain from action, but the selected option results in a decision which is untenable and unfairly deprives a litigant of a substantial right or a just result in matters submitted for disposition through a judicial system.
Wulff v. Wulff,
IV. ANALYSIS
We note at the outset of our analysis that the mother assigned two errors not mentioned in part I above. One relates to the order in which the district court ruled on the revivor of this action; the other deals with the date on which the district court ordered the credit to take effect. However, in her brief she failed to argue either of these claimed errors.
To be considered by an appellate court, a claimed prejudicial error must not only be assigned, but must be discussed in the brief of the asserting party. Neb. Ct. R. of Prac. 9D(1)d (rev. 1992). See, also,
Lange Indus.
v.
Hallam Grain Co., ante
p. 465,
Consequently, we do not concern ourselves with the mother’s unargued claims of error, but limit ourselves to a review of her claim that the estate and trust are not entitled to credit for the Social Security benefits paid on behalf of the daughter at the rate of $832 per month.
1. Other Jurisdictions
The majority of jurisdictions hold that a child support obligor is entitled to credit for Social Security benefits paid for a child’s benefit on account of the obligor’s disability. See,
Windham
v.
State ex rel. Windham, 51A
So. 2d 853 (Ala. Civ. App. 1990);
Binns
v.
Maddox, 51
Ala. App. 230,
(a) General Rationale
Some courts allow the obligor to make a unilateral reduction in the payment without any action by the court. See,
Binns
v.
*734
Maddox, supra; Andler
v.
Andler,
Hence, in
Chase
v.
Chase,
Although by far, most of the cases in which courts have allowed an offset against child support have been for Social Security disability benefits, other state courts allow an obligor to offset court-ordered child support by Social Security retirement benefits. See,
Cash
v.
Cash,
The rationale for both types of payment is the recognition of the presumed decline in income. As the court pointed out in
Potts
v.
Potts,
In contrast, cases which have held that a noncustodial parent is not entitled to credit against his child support obligation for Social Security payments have reasoned that receipt of such benefits does not constitute payment from that parent. See,
Hennagin
v.
County of Yolo,
(b) Effect of Agreement
The mother asserts that the incorporation of the property settlement agreement into the decree prohibits the crediting of the Social Security benefits against that obligation, as it was intended as a full, final, and complete settlement of the father’s child support obligation. However, other jurisdictions have ruled that the existence of a separation agreement is not determinative.
See Hamilton v. Hamilton,
In two cases similar to the one now before us,
Bowden
v.
Bowden,
In Bowden, the parents of the minor child entered into an agreement which required the husband to pay the wife $300 for the support and maintenance of the minor child, and to purchase and maintain life insurance policies sufficient to insure that the monthly payments for the support of the child provided in the agreement would be paid in the event of the death of the husband. The husband died testate, and the child began receiving Social Security benefits exceeding the $300 per month child support specified in the agreement. At the time of his death, the husband did not have in effect the insurance policy as required in the agreement. Pointing out that the purpose of Social Security is the same as that of an insurance *737 policy with a private carrier, wherein a parent insures against death or loss of physical ability to fulfill moral and legal obligations to dependent children, the court held that the death benefits paid to the minor child from the Social Security account of his deceased parent could be credited against the husband’s monthly obligations.
In Board, the husband agreed to pay the wife $200 a week for the support of their two minor children pursuant to a property settlement agreement. The husband died 3 months after the divorce, at which time the wife began receiving $370 per month per child from his Social Security benefits. In affirming the judgment of the trial court, the Court of Appeals had stressed that the wife would receive an unreasonable windfall if she were permitted to receive both child support and Social Security benefits. Affirming both the trial court and the Court of Appeals, the Supreme Court of Kentucky held that Social Security benefits could be credited directly without a motion for modification of the decree.
The mother cites
Cohen
v.
Cohen,
Cohen
is, however, different from the matter at hand; the purposes for which the voluntary support payments were made in
Cohen
are different. In this case, the father’s will provided
*738
only for the court-ordered child support payments. In
Cohen,
the property settlement agreement was a voluntary agreement to provide $40 a week for each of two minor children and the tuition for normal Hebrew School training for each of the boys and, in addition, to pay the normal and usual expenses entailed in tíre Bar Mitzvah. Hence, the agreement provided payment for a specified item, tuition. In accord is
Thompson v. Thompson,
In agreement with
Cohen
is
Williams
v.
Williams,
*739 2. Nebraska Precedent
Those decisions holding that Social Security payments are not automatically offset but are a factor to be considered are consistent with decisions in other Nebraska cases governing crediting of Social Security toward court-ordered child support.
In a creditor’s bill to enforce a judgment for back child support, Social Security payments to a divorced wife paid for the benefit of her children, following an incapacitating auto accident suffered by the father subsequent to the divorce, were held to have been properly credited against the final judgment.
Schulze
v.
Jensen,
Under different facts, the trial court in
Lainson
v.
Lainson,
After reviewing both the
Schulze
and
Lainson
cases, we, in
Hanthorn
v.
Hanthorn,
3. Application of Precedent
The fact situation in this case is different from those in Schulze, Lainson, or Hanthorn. Here, the father has died and the estate is seeking to offset child support payments by the amount of Social Security benefits received on behalf of the daughter.
In reported cases involving Social Security death benefits paid to a child, courts have allowed the noncustodial parent to credit Social Security payments toward child support, even though the payments are received on account of the death of the noncustodial parent. As the court pointed out in
In re Marriage of Meek,
Whether the Social Security benefits are received because of disability, retirement, or death of the obligor, courts allowing credit for Social Security payments against the parent’s child support obligation reason that dependency benefits are not a mere gratuity from the federal government. The benefits have been earned in part through the employee’s payment of Social Security taxes. See,
Flemming
v.
Nestor,
In like fashion, we have ruled that amounts paid to a mother under a military allotment are to be credited against child support payments owed by the father.
Hopwood
v.
Hopwood,
In
Hanthorn
v.
Hanthorn,
On the other hand, a modification hearing implies a change in the amount of the court’s order on behalf of the minor child and, consequently, requires a material change in circumstances. See,
Wulff v. Wulff,
In view of that distinction, the evidential hearing granted by the district court provided the mother with the opportunity to adduce any evidence of inequitableness arising by virtue of crediting the Social Security benefit of $832 per month against the father’s court-ordered child support obligation. No such evidence was adduced.
*743 V. JUDGMENT
The district court’s ruling to credit Social Security benefits toward the father’s court-ordered child support did not constitute an abuse of discretion. Accordingly, the judgment of the district court is affirmed.
Affirmed.
