It has nothing to do with other siblings, but something more serious.
There has been a disturbing story going on in the US that has gotten little media attention that has to do with black celebrities and James' family has gotten caught up in it. About two years ago, some high profile black male celebrities who are married to white women started getting racist vicious hate mail. The writer, who many believe is a white woman, says that the black man will be castrated and burned alive if he doesn't leave his white wife. Some of the celebrities who have recieved this letter are Supreme Court justice Clarence Thomas, actor Taye Diggs, a Miami Dolphin football player, and a few basketball players. Blake's parents got the letter after this person saw James and his family in a magazine. The FBI is supposed to be investigating this case.