Just say, 'i don't know' and end the conversation.
keep it ONLY to the kids.
this man disgusts me. he turns nice when he needs to and mean when he wants. his gf is sleaze.
get everything over to the law, and don't look back. don't answer questions after that.
if they get angry, don't break, just say
"you can call the police or the authorities to ask them questions - they will be happy to assist you, I don't have answers for you. Or, if you like the Internet and FBI website has plenty of information about Identity Theft. I found it very useful myself. Goodbye"