As you said, you took on the responsibility and obligations of parenthood when you chose to have children. Part of that is considering their interests when exercising your vote. While I don’t have children, I don’t agree that you have more skin in the game as you put it, than I do. I, as a human being and citizen of this country, want to see it succeed and flourish not only now, but long after I am gone, for generations to come. My family, friends and loved ones are all considerations when voting, as well as what I think will be best for society as a whole. It’s why when local votes come up for school funding, I always vote in favor of increases, despite having no children of my own benefitting from it.
Every adult makes life choices, and has various considerations for how they think the world should be, and what will improve it. The personal decisions you make and how you live your life should not afford you more or less votes than anyone else.