Mo. Rev. Stat. § 456.1-114
1. For purposes of interpreting a term of familial relationship in a trust, "descendants", "issue", "children", and similar terms of relationship shall be construed as follows:
(2) A child who is not conceived or born of a marriage is presumed to not be a child of a person who did not give birth to the child unless:
(L. 2022 S.B. 886)