Nickless
You need to explain clearly to dad what the problems are with junior, and he needs to explain to him what your role is and get him to let go and deal with it.
Sorry I wrote this before reading this page of posts.
You need to make it clear to dad that you can't continue in this role as it is, they asked you to take it on so they must have thought you could do it (and you can, I know you can) but if junior can't or won't let go, he needs to be made to or else you stop doing the job, they find somebody else (external or internal) who is going to last exactly the same time again and then they're at square one - again. And it'll just keep happening, though for how long before they realise?!!
Lay it on the line. Junior plays ball or you're leaving the game - now.
Jackie, Peer Moderator
www.iqps.org