As far as I'm aware, I believe they're fairly well off and normal. Striker is sort of the blacksheep. Though instead of disowning him and sending Striker out onto the streets, they keep their precious 400lb+ high school dropout content with games and food in the back of their house, since his very existence is embarrassing to the family. He's indicated that his relationship with his brother is very strained as well, with said brother mostly trying to ignore Striker's very existence. Said brother is a fairly normal person, if a bit overweight, but he looks normal and has a life.
Between
@DirkBloodStormKing indicating that Striker has had a past history of flashing women, and some other...Concerning things Striker has alluded to, it seems that some time ago, he might have done something particularly bad. Gotten into a lot of trouble, and at that point his life mostly fell apart. He dropped out of high school, became an ever inflating balloon in the back of his parent's house, and became the exceptionally creepy person we know today. Of course, this is all still speculation, but there has to have been something in particular that happened at some point to get him where he is, considering how normal everyone else seems to be.