Financial Aid Help!!!?

I don't get financial aid to pay for my college (Fafsa) becuase my parents wages are above or something like that. but the thing is my parents have 5 kids!!!! and they have to pay for 3 that are in colleges. I dont get it. i mean ya okay they get a good pay but they have to take in account that tey have 7 people in the family not that average 4 or 3