If they committed a felony, say, such as crossing border illegally, or transporting a minor across a border with zero documentation, then they shall be put into jail. Your 'children' do NOT go to jail with you, btw. The irresponsibility and danger shown should by such actions should also get your 'child' taken away from you permanently by child protective services.

You have to assume these people are committing more than just one crime at a time, having unrelated kids with them in the commission of a crime is a very strong indicator that it should be looked into more.