This throws a monkey wrench into the whole "they are separating children from their parents" public kvetching by those who were as silent as a whore in church when this sort of thing occurred in the previous administration. As a result, I frankly find it impossible to take such folks seriously.
Nonetheless, there is a possible solution for this potential problem: mandatory DNA screening of any child and purported parent. If the DNA match falls within the acceptable range of familial relations to ascertain probable parentage, then no problem. If however there is no such match, that would be a different matter altogether and the party in question could be taken into firmer custody, fingerprinted, deported, and ultimately lose any future right to legally be in the United States.
Nonetheless, there is a possible solution for this potential problem: mandatory DNA screening of any child and purported parent. If the DNA match falls within the acceptable range of familial relations to ascertain probable parentage, then no problem. If however there is no such match, that would be a different matter altogether and the party in question could be taken into firmer custody, fingerprinted, deported, and ultimately lose any future right to legally be in the United States.