That is just pure conjecture on your part.
His parents didn't divorce until 1960. He had a Julliard instructor for a piano teacher. He has lived a privileged life. His music is schmaltzy junk and he was pushed ahead of many more talented musicians by the record company. He ended up marrying a supermodel.
Boo-hoo. I'm depressed. Poor baby!
His father left the family in the mid 1950s. Joel is a musical genius who’s was admired by Leonard Bernstein, Irving Berlin, Paul McCartney, Pete Townsend and Brian Wilson. He’s written some of the most enduring pop standards of the last 35 years. Songs that will be around long after we’re gone.