Sorry guy, I cannot be helpful if you don't want to hear what I have to say about leaving her alone and even you have written that's what she wants,
her family all blocked me and my family...
obvsly she told them to do it because she doesnt want contact with me.
So leaving her alone is the thing for you to do. I mean come on guy, even though her sister has made contact with you,
but recently her sister added me and talks to me all the time and sometimes asks if I have a girlfriend? So what do you think ( and please be helpful )
Her sister doesn't count does she, and it's a game you better not play because you don't know what's really behind this "sending sis to get information" deal. This friendship thing cannot happen until you have healed and moved on, and don't care what her, or her sister thinks or you end up with high hopes and no pockets to put it in. That means you unless she contacts you with the straight truth, in person, leave her alone.
Could you be friends when she is dating someone else, rebound or not? Be honest with yourself, you want friendship to stay close if her rebound doesn't work, right? Hmm, maybe that's why sis contacts you, because you are the back up plan in case her rebound doesn't work!
Her option for when things ain't going the way she wants, and just in case she needs attention. Don't play that game, because then you would be the rebound wouldn't you. Somebody she can bide her time with until she finds better, or make him jealous.
Sorry guy, but it happens a lot, but you don't have to let it happen to you, if you leave her and her sister alone, and avoid the drama, confusion, and misery that will surely come of it.
Hope that was helpful, hope I am wrong. I know, you hope I am wrong too. Stick around, maybe another will come along and tell you what you want to hear, I cannot, because honestly, seen it happen more than a few times when people want something so bad, they follow the broken heart, no matter what the facts are.
Good luck.