Would you apply for a job on Craigslist?

I’ve been looking for part time jobs on craigslist because I am not getting any replies from jobs on workopolis. I just got a call from someone who has interested in interviewing me and hiring me, he seems like a nice person. He then asked me if I have any kids (I don’t), but I feel pretty uncomfortable that I am being asked this illegal question.

How do I decide if these jobs are legal, or barely legal or if I would even get paid at all or on time?