Michael ADORED his Dad and spoke openly about it all the time. Having been adopted, he, naturally, was more appreciative and felt he had to try harder.
I still don't understand, though, why every media person, every news story, has to emphasize that Michael Reagan is the "adopted" son. He was adopted as a baby, not as a 20 year old. I don't care for the distinction, frankly. I can see if it is explained as part of family background, i.e., Ron and Nancy had two children; by his first wife, President Reagan had a daughter, and they adopted their son Michael, or something like that... but everytime Michael's name is mentioned, it seems to be prefaced with "adopted son." I think that is just irrelevant and disrespectful.