It is has been around a year since I am focused on coming out fully. Everyone knows except my folks who I have not yet informed. This whole year I am wondering how to do it and recently I thought... okay my birthday is coming up... maybe thats a good day to do it? What do you think?
I say, if you think that there's a chance it will go badly, don't. do you really want your birthday to be thing tht ruins your life.
I told one side of my extended family a couple days before my birthday last summer, although part of that was just because I happened to be back home at the time and could tell them in person.
Don't rush it. These things take time and therefore you shouldn't push yourself to pick a date with meaning. Relax, take a breather and think about how your folks will react. There really isn't the perfect moment to do it, but when the time is right, you will know. Just try and do it when it would be less stressful. And maybe ask your sister for support since you have come out to her.