Kiddushin 64: Permissive Halakhah

More mishnayot - more cases of a father betrothing his daughter (who is not the age of majority). What if the father says he has done so - when is he believed or not? Also, one who says at the time of his death that he has children (keeping a wife who has no children with him from needing to do yibum) - he's believed. If he claims to have brothers (giving her the need for yibum), he's not believed. Plus, a father who has several groups of daughters, from two wives, how to handle unspecific statements of betrothal regarding those daughters?