To Adults: There's nothing evil about that CPS worker at all. If he seems hellbent on tearing them apart, it's only because Lilo is being raised in an awful environment and rescuing her from it is his damn job. She's in the care of her older sister Nani because, as in every Disney movie, their parents are dead. It's understandable that the two might struggle to keep things together after that -- and they do struggle indeed, but a lot of it has to do with Nani just being downright negligent and irresponsible.
Early in the movie, Lilo is left to fend for herself and find her own way to hula class.
Mandatory for all Hawaiian children.
Sis couldn't set up a carpool with one of the other kid's moms or something? Even worse, she's late picking Lilo up afterward, and the teacher tells the kid, who can't be more than six years old, to just wait on the steps until someone shows up. What if no one is showing up, lady? Maybe there's been an accident! Sometimes it seems like the CPS worker is the only one who actually cares if Lilo lives or dies.
That seems even more true when, naturally, Lilo doesn't wait on the steps and instead decides to walk. Luckily, she makes it home safe, at which point we get a look at the house she lives in, and boy is it a shithole. Clothes everywhere, the kitchen is gross, the stove is on for some reason, you name it. Even worse, it's a shithole Lilo is all alone in, because her "guardian" is still nowhere to be found.
Would it kill the kid to maybe throw a load or two in the washer?