You're mixing things up. One theme is deciding on kids school, activities, judo over karate and so on, the other is deciding for them what's their political stance before they get to know things. And as @amolbhatia50k said deiciding on the future of society based on having kids and so on.
Also he made great points, so a someone who has kids but is a shitty parent should have more voting rights than someone who doesnt have or cant have kids?
The whole idea is ludicrous.
It is completely moronic and absurd. Almost as absurd as thinking that anything Vance says has any credence at all.