Who am I supporting?

I'm a guy who uses a streaming service to find new music.  Periodically, I'll make a list of the things I want to go ahead and buy in some form, and buy them.

I buy basically as a way of "voting" for the music I like, and to support musicians.  Something I've always wondered about, though, is who am I supporting when I buy the music of deceased artists?  Not the artists, obviously.  I assume in many cases their families get some royalties.  But where does the money generally go?  Is the label just gobbling up those dollars?

I listen to a lot of jazz and blues, and the bulk of the artists are no longer with us.