Why do you think this doesn't come up? As a single father of course it came up in every funding/hiring discussion I ever had. And it was perfectly reasonable

Why do you think this doesn't come up? As a single father of course it came up in every funding/hiring discussion I ever had. And it was perfectly reasonable for them to ask, due to the roles I was being offered. If I got offended by that, I didn't understand the sheer amount of work and effort those positions were going to entail. If I'm hiring a 9-5 support tech, it's irrelevant. If I'm hiring a "kills the company if it's the wrong hire" position, you bet your ass I'm looking at it from every angle. And someone being able to commit 100% to that is very key - doesn't matter if it's kids, sports, hobbies, whatever. If you decide you want work/life balance, a startup founder is not for you. At least one that is funded by VCs.