Please help me with this family situation?

You may not like what I have to say. I think that 1/2 the problem is with you. I suspect that internally, you may feel this is almost uous....when it is not. Ask yourself if you would have reacted so violently had this been any other boy! (I must say your sister's actions were inappropriate, but that is another issue. These kids are showing very poor taste in carrying on like this in front of anyone, let alone family! Ask to have a sit down and talk this out. Explain your reactions, Give them a sincere "sorry" and ask about theirs. Compromise is called for here, and apologies all the way around. IF these two want to actually date, fine...explain birth control on BOTH their parts. No sleep overs, not screwing around in front of anyone, let along family! As for you, chill out...surely you have a life of your own to lead...so do it. NOW...ask THEM how they are going to feel/react towards one another should the affair run its coarse, they are no longer "friends," yet still part of the family!!!!!! They have not thought this through! GW