Do not concern yourself one iota in regard to where the money goes, because in 9 out of 10 times the artists family will not get one red cent.
Jazz musicians have been notoriously bad business men, and the most prominent record companies were always quick to take advantage of that. When you add in the fact that some of the best jazz musicians were addicts, and no one can be taken advantage of easier than an addict needing a fix; you get the picture.