Fresia makes a good point -- the thing it mostly really comes down to is what outcome you might expect from it. If the balance can be expected to be generally positive, do it. If the balance is very likely to be negative, you may not want to. Or wait to. Living at home obviously impacts this decision. You may find the timing better for you at a point you are not living there.

I've got a different situation in that I live far far away from all family and have for many years. Was interested that you brought this topic up, because as it happens, I just told my Dad (hehe, on Father's Day...). Don't talk to him often, but usually at length. The timing/conversation just never felt right. Until the other day. The conversation was revolving around how people are all different and learn in different ways and that variety is a good thing, because if we were all the same it'd be pretty boring. Good time, yeah? He was TOTALLY COOL about it!!! What a relief it was! I kind of thought he would be, or at least not antagonistic, or I wouldn't have. (Which is why my mother doesn't know. I barely speak with her and don't need the aggravation.) My sister was the only relative that knew before that. They're still the only 2, but living so far away and not interacting with any of the relatives, it's really not as issue.

Still, I very much understand your trepidation considering being under the same roof. Have spent lots and lots of time living in very small towns, soooo...as a neighbor used to put it, "Everybody knows your business before you're even back to your door." I was far more afraid of repercussions there, even while feeling badly about not speaking out about it.

You say you're tired of keeping this secret. Sooo, perhaps waiting for a good conversational moment *and* making a point of letting them know that you care enough about their feelings that you don't want them finding out from someone else, may help make them more receptive if and when you decide to tell. Good luck!