Are parents only 50% responsible for raising a good person with morals?

My cousin and her husband just had their first child several months ago. It's a baby boy. They want to raise him to be a good man of actions with good values and not a POS like some (not all, some) men are nowadays in this generation.

They don't want want their son to grow up being a future faker, a user that strings along women for sex nor another of those Chads. Are parents only 50% responsible of what their children become as an adult?

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Their baby boy is obviously an innocent human, pure of malice. They don't want their child to later on be corrupted.
Are parents only 50% responsible for raising a good person with morals?
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