This is the absent father? As long as you are not forcing the boys (which I know you aren't), I think it's a good idea. Even if they never have anything to do with him, they will always wonder. And a little "better late than never" might give them a little more peace about the whole thing. My dad was in his 50s before his dad ever bothered to contact him. They never actually met, though. The man died before it could happen, but I do think even the phone contact put my dad a bit more at ease. Prayers it all goes well.