Of course they want to keep up the public appearance that they don't support him, so they say the took away his access to the family fortune, which is in the billions. Who knows. The family has hundreds of members. Bin Laden had over 20 brothers alone. Some must support him while some likely truely do oppose him.
Edit: 54 brothers and sisters.
One tie between the Bushes and Bin Ladens:
xxxhttp://www.americanfreepress.net/10_07_01/Bush___Bin_Laden_-_George_W__B/bush___bin_laden_-_george_w__b.html