Legacy

Kassie doesn't have a close family. She barely has a family! Jake's the oldest, and he takes care of her and Matt; her twin brother (he's only 2 minutes older). Then there's Dean... He's one year younger than Jake and two years older than Matt and Kas. With his good grades however, he was able to graduate with Jake's class, leaving his family in the dust on his way to college. Their parents are both gone; both killed. Leaving Jake to take care of them.
Matt and Kas have just graduated High School, they have their whole lives ahead of them. Kas is off to Juliard with her boyfriend, Justin, who's been in community college, waiting to further his education in medical school, and Matt is off to Law School. But when Dean shows up, surprising them all at the graduation, their big night at their party turns to ruin. Some big family secret reveals itself, each one telling their part to this mystery. In the mess of it all, they get a visitor. It just so happens that it's their dad's brother, with all the answers to their questions. Is this guy too good to be true? And why are they finding out about him now? After all these years of having no knowledge about their family, this guy just shows up on their doorstep, asking for nothing in return.... That's not suspicious at all!
With all the things they're learning it doesn't seem like anything could go wrong..... Right?????
........... I don't think I can allow that.
(BTW crappy summary, but it's way better than it sounds. Trust me! I just didn't want to give too much away)