Just out of curiosity, does it matter what the questions are actually about? Even in the US if you ask a woman if she plans on getting pregnant you're going to have issues. But I would imagine if a woman was answering a general "tell me about yourself" type question and mentioned her kids, the interviewer might ask a follow up, particularly if they have a similar interest or something (obviously staying away from "so are you going to have more?" or whatever).

I'm a guy so I've never been asked about kids until after being hired, and even then just conversationally at lunch.