Actually he addresses all of the children he raised in the song, his daughter, his adopted nieces and his brother whom he also raised. Incredibly they all have become solid adults by all accounts, despite the turbulence and his struggles with addiction. I know quite a few people who have frequently bumped into one or the other of them through the years and I've actually crossed paths with MM himself over the years a few times, occasionally with some of the kids with him. My experience matches with everyone I've talked to -- if you didn't recognize who they were you'd never pick them out in a crowd. Simply regular people going about their day, polite, no attitudes.
That's precisely the reputation his daughter had as a college student as well. Very different from the daughter of another native Michigander music superstar I won't name who was widely known as a complete diva on her college campus.