Another case in point: the Polgar sisters[1][2][3], raised by their father[4] to prove the point that "geniuses are made, not born".

[1] - https://en.wikipedia.org/wiki/Susan_Polgar

[2] - https://en.wikipedia.org/wiki/Sofia_Polgar

[3] - https://en.wikipedia.org/wiki/Judit_Polg%C3%A1r

[4] - https://en.wikipedia.org/wiki/L%C3%A1szl%C3%B3_Polg%C3%A1r