Can personal property that is not mine be seized in bankruptcy?

by Daisy
(Phoenix, AZ, USA)

Hi - My boyfriend, our kids, and I live in a house that is entirely owned by my dad. My dad and boyfriend own a lot of property in the house, and I own very little. If I declare bankruptcy in a few months (to discharge 3 credit cards, each with about $10,000 debt), is there a chance that the house will be searched, and my boyfriend's property will be seized? There isn't paperwork showing who owns what - is that a problem, or can he just declare what is and isn't his property? What can I do to be sure that his property isn't seized? He is listed as an authorized user on one of my credit cards (not on the credit application contract though)- will that be a problem too? Thank you.