I saw a similar effect teaching at a coding school for adults: one of our strongest predictors for success was whether or not the student had someone close to them who was in tech. Having someone outside the system to practice lingo, talk about culture, or give an opinion on what topics matter makes a huge difference. I see no reason why grade school math would be different - I know my parents made a huge difference for me, not by "pushing", but by just being there to talk.