I also have children and they also like to put small details in the sink. Sometimes it's pencils, when it's Lego figures, sometimes it's paper, a lot of paper! When I have time, I clean the plumbing myself, when I don’t have it, I call specialists https://chosenrooter.com/ so that they quickly eliminate the blockage. In general, I get out of the situation as best I can. Recommend protecting the sink from children!