(a) For the purposes of this section:

1. (1) “Aunt” means the sister of a person’s mother or father;
2. (2) “Brother” means the son of a person’s mother or father;
3. (3) “Daughter” means a person’s natural daughter, adoptive daughter, or the daughter of a person’s husband or wife;
4. (4) “Father” means a person’s natural father, adoptive father, or the husband of a person’s mother;
5. (5) “Granddaughter” means the daughter of a person’s son or daughter;
6. (6) “Grandfather” means the father of a person’s father or mother;
7. (7) “Grandmother” means the mother of a person’s father or mother;
8. (8) “Grandson” means the son of a person’s son or daughter;
9. (9) “Mother” means a person’s natural mother, adoptive mother, or the wife of a person’s father;
10. (10) “Niece” means the daughter of a person’s brother or sister;
11. (11) “Nephew” means the son of a person’s brother or sister;
12. (12) “Sexual intercourse” means any act between persons involving penetration, however slight, of the female sex organ by the male sex organ or involving contact between the sex organs of one person and the mouth or anus of another person;
13. (13) “Sexual intrusion” means any act between persons involving penetration, however slight, of the female sex organ or of the anus of any person by an object for the purpose of degrading or humiliating the person so penetrated or for gratifying the sexual desire of either party;
14. (14) “Sister” means the daughter of a person’s father or mother;
15. (15) “Son” means a person’s natural son, adoptive son, or the son of a person’s husband or wife; and
16. (16) “Uncle” means the brother of a person’s father or mother.