Yeah, those people are almost always young men/boys. The family can then use his residency status to get in themselves. We call them “anchor babies” over here. Also, human smuggler aren’t cheap, these families aren’t poor because then they couldn’t pay the smugglers.

The only solution is to wait until they are confirmed to be over 18 and then send them home. If they are actually a child, keep them until they turn 18 and send them back.