If people are coming across the border with kids that they don’t have proof are theirs, what do you do?

Do we send the kids back across the border with the adults that brought them across?

How do we find the parents of these kids once they are detained?

It seems like a hard problem to me. Ideally we’d reunite these kids with their parents. The logistics of finding the parents of thousands of undocumented minors is pretty intense.