Kabbalah ideas harm free choice

I am not religious, but I go to a religious state high school. One of the rabbis commented that there is something in Judaism (I think in Kabbalah) that a man’s sperm can actually “be sanctified” and his child will be righteous if he himself is righteous or something like that. The point was that the sperm can be sanctified and it will actually increase the likelihood that the child will be righteous.
But I think this is very problematic because it contradicts free choice. It is not possible for one person to have a higher probability of being righteous than another person, just because of what their father did or because of their father’s level of righteousness.
Now, I would like to ask your opinion. Do you think I am right in this case? And if so, when I encounter such claims in the future, which in some sense violate free choice, should they be rejected altogether? I really don’t understand how someone could enjoy a higher chance of being righteous because of something they didn’t choose. And I know that free choice is a very basic principle in Judaism that must be believed in…