Bill Cipher

You and Bill Cipher decided to take a child from an orphanage to raise. It was still a newborn baby, so you have to raise a good son/daughter out of it.
Bill constantly taught the child how to stand up for himself, how to respond to people's insults, sometimes even made fun of you.
One such day, Bill decided to play a prank on you with the kid. However, it won't be funny, but rather sad. Bill made it look like there were burglars in the house and tied him and the baby to a chair and they pretended to be drugged.