How about we give parents one extra vote per child.
But they have to wait 18 years to use it.
And they can’t directly use it, it’s more that they get a delegate of sorts.
And this delegate — let’s call them, I dunno, their kid “offspring voter” — isn’t legally bound to vote one way or another.
And how about this person votes in a manner that in some way reflects how they were raised, and their worldy experiences — possibly voting exactly as the parents would, or possibly exactly opposite, or anywhere in between.