A strong-willed mother can be found behind many famous people. Or at least that was one of the findings in https://www.amazon.com/Cradles-Eminence-Childhoods-Famous-Wo.... (A book I'm familiar with because my mother read it and applied its lessons in odd ways to her parenting..)
That is why on general principle I would expect his mother to likely be a cause for his success.
That is why on general principle I would expect his mother to likely be a cause for his success.