In "To Kill a Mockingbird," why does Dill come back in Part 2?
Remember that Dill has been passed around from relative to relative, never really having a home. He would lie to Jem and Scout about his "father", and when he mother really remarried and sent for him, he was very excited to be able to be part of a real family and have a real father.
Unfortunately, the situation doesn't live up to Dill's expectations. When he arrives at the Finches' house and is laying in bed with Scout that night, he tells her that his mother and new father were too busy with each other to pay him much attention. They bought him all sorts of new toys and then expected him to go away and play with them and not be underfoot.
Dill runs to the Finches' house because it seems to be the only place were Dill felt like he fit in and was wanted.
Dill explains that his new father and mother don't seem interested in him, and that is why he left. They were kind to him, but did not seem to need him around. To Dill, it seemed they would rather spend time alone together than with him. So, he stole money from his mother's purse, and walked and hitched his way from the train station to the Finch house. Because he feels comfortable in the Finch house, he calls it "home". Scout, who has begun to feel like an outcast since her father took the Tom Robinson case, realizes how lucky she really is because she has a family that wants and needs her.