Falling apart at the seams

I am officially falling apart. Around 1 today, I got a call from my mother to tell me that she was leaving my father. Apparently she has been having an affair for some months now and it came to a head today. I am feeling very effected by the whole thing but feel worse for my sister. I have a sister who is 17 and about to be a senior in high school. She now feels like she has to chose between them. I wish i could be there but I am three states away. I am also just trying to get everything together in my own brain.