Although Jem and Scout are being brought up in a one-parent household, they get far more attention from Atticus than Dill gets from both of his parents in To Kill a Mockingbird. Dill's parents ship him off to Maycomb each summer, presumably because they prefer to be without him for a few months each year. Atticus spends as much free time with his children as possible and advises them when he feels they are in need of it. Dill's mother apparently divorces her first husband because the boy speaks of his new father later in the book. Neither of them seem to have much inclination to spend time with him, however. Dill's parents lavish him with more gifts and monetary favors than Atticus, but Jem and Scout seem to sense that this is in return for their own lack of time and interest. Atticus gives his children a large degree of independence for kids so young; Dill also is given more freedom than most kids. However, Atticus does this in an effort for his children to learn things on their own terms, while Dill is forced to do so because of his parents' lack of hands-on participation.

The major thing that is similar between the two families is that both families love their kids.  But there is a major difference.

Atticus Finch really wants to be around his kids and to do things with them and to let them participate in his life.  He doesn't just kind of push them off to the side to do their own thing.

By contrast, Dill's father seems to not really have time to do much with Dill.  So Dill is kind of lonely in a way that Scout would never need to be.  I can't imagine Scout ever saying that she didn't have a father the way Dill says that he doesn't even though his father is still alive.

Contrast Dill's family situation to that of the Finches.

Dill has an unstable home environment. His mother has recently remarried, and it's clear that he's not getting much attention from either his mom or his new step-dad. It's not altogether surprising that he should run away from home and hide out at the Finch residence. However, Dill greatly exaggerates just how bad his home life is; he spins elaborate tales of his step-father physically abusing him. But as he later confesses, they're completely untrue. That said, it's certainly the case that he doesn't receive much attention from his folks, and that's a kind of abuse. One gets the impression there's not a whole lot of love at home.

The Finch family couldn't be more different. Though Scout and Jem are just as likely to get into scrapes as Dill, they have a proper loving home environment to fall back on. Atticus sets boundaries for his children; though Aunt Alexandra may not think so, he doesn't just open the door and let them run wild, whatever his hyper-critical sister may say. Whereas with Dill, it seems to be the case that his family is...

Contrast Dill's family situation to that of the Finches.