Lost souls

I have 3 brothers, 2 step brothers included.
One, for some reason I don't miss. maybe 'cause I do think about him enough to know what he's up to - more or less.
One, for some reason is lost, but I'm close to his kin, and that makes things awkward.
One was lost many years ago - and it he that bugs me most. Any one know where Russell (was Hatton) is now?