
Quoting
aardvarc
OK - there are a LOT of misconceptions going on here.
First, you're not a "random teenager" - you're a sister (biological I assume). However, you'll find that LOTS of landlords don't want to rent to 20-something tenants who have younger siblings with them, regardless of if one sibling has legal custody or not. They don't want their properties to become "party central" (not saying this would be you, only that landlords usually come up with such guidelines after an expensive experience or two). Most likely he set the bar here very carefully - basically saying only LEGAL children or wards - knowing full well that a change in guardianship would be HIGHLY unlikely. A good way to say "I don't want a bunch of minors living here, and I don't want to be sued for discrimination either". Smart guy, really.
Second, if your parents are giving you a monthly stipend, then you are going to be considered their dependants which will nix the whole school financial aid scheme. AND, even IF you got a change in guardianship, you'd still have to declare their income.
And finally, the reasons you've listed aren't going to press upon a judge that a change in guardianship is in your best interest. Guardianship isn't considered on what's easiest or what might garner the biggest windfall of school financial aid. It's considered on much bigger and broader factors and unless there's something seriously wrong with your parents, I wouldn't count on a court's blessing for the change to be approved.