alt Hacker NewsBackwards. The government knows who has kids because they do things like issue birth certificates and operate state schools. In a lot of places it's legally very difficult not to be listed as a parent on government records.
So why should I have to prove I don't have kids when the government can know I'm not on any of those lists?
The government departments know those things because the parents registered on those lists. It doesn’t automatically just “know”, and that info is historically not usually shared between government departments