Spoilers ish/guessing

I actually feel like it was the father, who might have survived. The little girl had the keychain, yes, but she seemed too young to be the killer now. Only a couple years have passed after all. If anything, I think the father chose a rabbit costume in memory of the daughter he lost.

Y’all don’t know that the rabbit videos were pre-recorded and weren’t live .. so it is possible for the wife to be the rabbit and not the husband.