How common is this..

My faction leader and a legendary commander ( 10 stars ) is getting old, all of his brothers are already on the other side He is living his last years in the capitol, enjoying life after a life long campaign. Every able family member is out commanding a legion and there is nobody to take over his grizzled veterans, so he on his own decides to adopt a garrison commander to the family, how common are such adoptions?

This wasn't the "Man of the Hour" event, it just came up that Amulius the Mighty wanted to adopt that man, that's it.....not that I am complaining or anything ~D

I usually have my faction leader sitting near my border somewhere and his heir out fighting the good fight so he can get better stats so I rarely get adoptions but it is quite handy. I usually get man of the hour a lot because if my general dies I just keep on fighting my greeks need no guidance for Nike herself guides their swords!