Advice: How to tell your parents you want to move out.?

Just be brave and break the news. Its going to happen and proscinating will not make it easier. Since your sister already has done it maybe it won't be so hard for you. Just say you want to be independant, and take the responsibility of taking care of yourself. Its really a good thing if you can do it, you have a job and can pay the bills, the responsiblity is huge he should be proud. Good Luck!