Where is Home?

Jon looked around. This was his house...but Sarah was acting like he didn't belong there. The problem was...if he didn't, where did he belong? He reached into his pants pockets to check for clues. He found his wallet, cell phone, and keys. He tried the wallet first and hit the jackpot. He had taken driver's ed...so he had an ID with his address on it. He didn't recognize the address, but started to head there, hoping the keys in his other pocket would open the door there. And they did. He quietly snuck inside and was trying to figure out how to find his bedroom without arousing suspicion when he became aware someone was behind him.