No, the 'biggest influence' that parents have on their kids are the values, attitudes, the disposition, the care, the temperament, the focus, the self restraint

No, the 'biggest influence' that parents have on their kids are the values, attitudes, the disposition, the care, the temperament, the focus, the self restraint and self discipline , and all the other behaviours they instil in their children by instruction or by example. After that I would say it's economic and social class. Of course genes play some role, but there's a pretty low correlation for inherited IQ anyhow.