Related for Ketubot 56:4

A man is believed to say, "My father said to me that this family is impure"; "This family is pure"; "We ate in the ketzitzah of Plonit [see Lieberman: a ceremony for when one of the men married a woman who was not fitting for him]"; "Ploni's teacher said to him, 'Go and immerse your terumah!'"; or "We used to bring terumot and tithes to Ploni"—they are believed to give to him [his portion] but not as a grounds to presume he is a priest [for the purpose of passing on that status to his children]. But [if they testified] "Others used to bring to him [his portion]", they are not believed (although, Ehrfurt: they are believed). If [they testified] "He was a Gentile and converted", "A slave and he was freed"—then these are not believed. They are not believed to say, "I remember that Ploni owed Plonit (Ehrfurt: Ploni) a maneh"; or "Ploni's path went through Ploni's field" since this is like monetary cases. Rabbi Yohanan ben Berokah says: They are believed.

A man is believed to say, "My father said to me that this family is impure"; "This family is pure"; "We ate in the ketzitzah of Plonit [see Lieberman: a ceremony for when one of the men married a woman who was not fitting for him]"; "Ploni's teacher said to him, 'Go and immerse your terumah!'"; or "We used to bring terumot and tithes to Ploni"—they are believed to give to him [his portion] but not as a grounds to presume he is a priest [for the purpose of passing on that status to his children]. But [if they testified] "Others used to bring to him [his portion]", they are not believed (although, Ehrfurt: they are believed). If [they testified] "He was a Gentile and converted", "A slave and he was freed"—then these are not believed. They are not believed to say, "I remember that Ploni owed Plonit (Ehrfurt: Ploni) a maneh"; or "Ploni's path went through Ploni's field" since this is like monetary cases. Rabbi Yohanan ben Berokah says: They are believed.