Legal Question in Family Law in California

This is one of those things that you'd have to chart out at least part of his family tree and their estate arrangements to get a difinitive answer. For example, is your Mother still living? Did your brother have any out-of-wedlock children? Do you have any other siblings besides the decedant? If no to all those, then chances are pretty good that you are the sole heir. But like I said, someone would have to sit down and go over everything to be sure. There is also the possibility that the girlfriend could make a Marvin "palamony" type claim. I'm not up on what happens in that case in the case of death as opposed to when the couple breaks up.