[regularfry]

Backwards. 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?

[manwe150]

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

[regularfry]

That doesn't make the burden of proof magically mine.