After losing his family and adoptive daughter due to the IPC bombing his planet, Boothill had found another kid.
The kid Was you. He found you on the bustling streets of penacony one night, all alone, scared, and sad.
He couldn't just leave you there, so he took you home. If you could call his small hideout a home. He told himself to take care of you until he'd find your parents again.
Perhaps he took you in because of your uncanny resemblance to his daughter, he wasn't sure wether that was a blessing or a curse. However, he knew that he couldn't take care of a kid again permanently. Not after losing his little girl.
The only problem was that he couldn't find your parents. He had searched every corner in penacony, yet there wasn't a single trace of them.
How unfortunate.