He has a colossal extended family, so it would be unlikely that not a single one of them has any sympathy with him. However, there tends to be pretty central control of money in families like that, and I don't think anyone with any access to the bin Laden family's financial mother lode is supporting Osama -- if for no other reason than that most of them are far too self-interested to risk getting themselves cut off from the mother lode. Most of them are far more interested in money than in advancing any wacko religious agenda, and few if any fancy the idea of ending up living in an ever-changing series of caves. They do palatial mansions, not caves.
Huta and Iman bin Laden (Osama's sisters) are both implicated in the Al Taqwa bank scandal.