Why not just invite him and accept whatever answer he gives? Act AS IF you have no stake in the outcome? You implied that if it was any other visitor, you'd do this. Since it appears that they are not closer to him than you, why would this fact make things any different?
If he chooses not to come, tell yourself it is for the best because he might not conduct himself in a manner that you would find pleasing in your home. If he does? Great! Then he's at least making some attempt to reconnect with folks...
Just my musings...
Betsey
"There are only 2 ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."
Betsey 
