Most Helpful Guy
I don't know exactly what has happened between them, and neither do you. Like always, there's his story, her story, and somewhere in the middle, there's the truth. Unless one of them is hitting the other or threatening to do so, there's not a lot of call for you to take sides. You have a lot of hard days ahead, getting your mind around everything, so don't worry too much about your folks. They're going to be worrying about you if they're decent people.
Check out the stages of grief. You're losing a big part of the world you grew up in, and that's gonna hurt a lot. You need to deal with that hurt. That's your main job in this, aside from being there for your family.