https://www.snopes.com/fact-check/jd-vance-parents-vote/

“These children are the future of this country and yet the parents who have them actually have no advantage in our democratic process,” Vance said. “They have a smaller voice in some ways — in very many cases — than the people who don’t have any children at all. The children who come from these families have no real representative in our democracy. Why don’t we change that?”