It is forbidden to cause the spread of misinformation defaming another's lineage: Niddah 13a
Testimony based on a Childhood memory of hearing that a certain family's Lineage was [Not] Kosher: Ketuvot 28b
Testimony that a person was at a Couple's Ketzatzah: Ketuvot 28b
Status of an Infant found in the Market: Yoma 84b-85a, Ketuvot 15a-b
Mother's credibility on her child's lineage: Ketuvot 12b, 13a, 13b, 16a
Mother's credibility if most of the world is permissible to her: Ketuvot 14a, 14b-15a
Requiring One Majority or Two, to establish the situation: Ketuvot 15a-b
If Both members of an engaged couple say the child is theirs: Ketuvot 14a
Child of Unknown Lineage
Vis-a-vis property of the Father, and Kehunah: Ketuvot 13b
A child of unknown lineage, who is considered to have valid Lineage: Ketuvot 13b
If a Child is silent to various Accusations of problematic lineage: Ketuvot 14b
The child's status follows the poorer of the two statuses of its parents, in a case where the union is prohibited: Temurah 5b
Relations between an illegitimate child and a regular Jew
