Demeny voting in the US (or elsewhere)

"Demeny voting is the provision of a political voice for children by allowing parents or guardians to vote on their behalf. The term was coined by Warren C. Sanderson in 2007.[1] Under a Demeny voting system, each parent would cast a proxy vote, worth half a vote, for each of their dependent children, thus allowing for a split vote if the parents' political views differ. Once children reach the minimum voting age, their parents would no longer vote on their behalf." https://en.wikipedia.org/wiki/Demeny_voting

AFAIK no jurisdiction in the US has experimented with it, and arguably it would be a violation of one-person-one-vote, because it is *not* the equivalent of giving children the vote; the interests of parents and their children are not necessarily identical. (An analogy: Suppose that in the era before women got the vote, each married men was given an extra vote to "represent" his wife.)

But what other countries might adopt it? (As the article notes, it has been advocated in countries with a large aging population like Japan in order to combat "gerontocracy.")
 
In practical terms, it is not voting on behalf of children. Almost no one will honestly vote in their childrens' interests if they differ from their own beliefs, or more likely will convince themselves that their childrens' interests are the same as their own beliefs. So, instead, it is simply granting parents more political power than people who don't have young children. That's all it is.

So I have a hard time seeing any country adopting it. Maybe there are some where the government (or at least the current ruling party) might see an advantage in it and get it passed, but that's it. For instance, young people in the US are majoratively liberal, and it is young people who have submajority children, so the Democrats might have an interest in giving parents more votes. But I simply cannot conceive of it passing here.

Also, what happens if one parent is dead? Does the surviving parent still only get the extra 0.5 votes per child, or do they get the other half, too? This all sounds incredibly unfair. And the gerontocracy thing seems like a sort of a manufactured crisis.
 
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