Switch "No children" does not work

[Akagitsune#1708]

It annoys me that I can't flip the switch to "No children" at any moment, cause It is blocked when there are no seats in the house or when one of the couple has a special trait. I have to remember this couple, their children, and catch the moment when they want children to click "no, you don't want" to? This thing drives me crazy.