Criminal Sentence 259: How Many Parents Do You Have?

From a blog I read:

"I lived in my parent's house."

I don't know if this person is a child of a single parent, but I'm guessing not. He would have said "my mom's house" or "my dad's house." Therefore, I think he was fortunate to live in his parents' house--that's s apostrophe, not apostrophe s.