The most proof we have is that song she sings, which seems directed from mother to father. (Mrs Afton to William) Seeing as she thinks Mike is William in SL, it's a small step in the direction of "proof", however it doesn't actually prove anything. There's also the Fazbear Frights story which seems to connect her with mothers, but again, it's only a sliver of proof that proves nothing. So yeah, I agree. However, Funtime Freddy And Foxy are suspected to be possesed by more kids, and they were part of Ennard, so there is a chance they are the souls in Molten Freddy. Jeez, I wrote a lot.