If you forget about the question of why is it that someone's parents are rich, parental socioeconomic status has comparable power in explaining children success

If you forget about the question of why is it that someone's parents are rich, parental socioeconomic status has comparable power in explaining children success as the child's IQ has. Reference paper: "Intelligence and socioeconomic success: A meta-analytic review of longitudinal research", Tarmo Strenze.