as a parent i can say this.not that it is What your situation is ,

kids take advantage of the fact that when they need or want
"we pay for it",
at sometime in the future we expect you to start
"paying" for your own stuff,
and while ya at it,dont forget mothers and fathers days.

nick when ya say ya fight every other day over the stupidest shit then let me tell ya this, it is not JUST them being that way,stop some your shit and maybe they stop some thiers.and yaw will get along better,Hopefully anyway, i hope you do.

when was the last time you did something to help your parents out without expecting something,a allowance and trip and new 4 wheeler ,something ???
as a parent i can say 'we do all day every day for you kids and only expect you to grow up and not be a axe killer and make your living doing something you enjoy at best and can stand at the worst'
admits,some parents are fucked up, hope yours aint cuase then your on your own.

shock them and clean the house up,hehehe
they will wonder what you did wrong (jokes)

peace