Sure they can mix. What ususally happens (as in the case of my two cousins who are brothers) is that once some real money starts to be made its then you see who's heart is clean from who's isdutty.

Want to find out aperson's character. Give them the chance to earn big money. Family or not. Family run businesses have been around since day dot. So dont see why it cant work. But there are members of my family I wouldnt entertain going in business with. Because I know how they stay already.