Named after, I like some of your Indy 4 idea, but I'm afraid there's just one part I can't agree with...
Indy hasn't spoken to his son. Remember how Henry Sr. in Last Crusade was towards Indy when he was growing up.
"What you taught me was that I was less important to you than people who had been dead for three thousand years in another country and I learnt it so well, that we've hardly spoken for twenty years."
I honestly believe that Indy would never abandon his children. Therefore, I think it will be more like:
Indy: "Mutt?"
Mutt looks up
"Yes, dad?"
Indy looks at him blankly
"What?"
Looks at Marion.
Marion takes a deep breath.
"Indy, I've been meaning to tell you. Mutt is our son."
"Oh, that's just great. Well, when were you going to tell me that
we have son?"
replican't said:
I hate that Sallah bloke - good riddance to him is what I say.
What? How can anyone hate Sallah.