Funny to see how Jagger is there, to protect and guide his rebellious son, 15 yo Keef Richards!
To me the Glimmer Twins are in fact a father/son relationship : I'm sure Mick spent countless days anguishing over the idea that Keef might die from an OD or spend 15 years in the slammer... like a worried loving father.
What did he get in reward when Keef finally cleaned up at the end of the 70's? Scorn, anger, and verbal abuse.
I don't know how many biological children Mick has had over the years but symbolically Keef is one of them, definitely.