He promised to take revenge on the bastards who killed you, his beloved though adopted child. Even if he wasn't completely human, he was clearly more human than those who killed you.

Boothill loved you the most, you were the meaning of his life.

Now he was just walking on the street, but he heard a child's voice. "Dad!" he heard the child's happy exclamation, and turning around, he saw you.

He couldn't believe it. His eyes widened. "Dad?" he says a little quiet.