Someone requested me to elaborate on this post so here it go.

                      The argument for the zero policy and, the Wall is that drug pushers and, MS13 is using children to get into the country.

                     Unless they are using their own children as a tool then the children are someone else’s.  

                     With a Blood type or, a DNA test they can find out if they truly are related.

                     The argument against this is, because of the amount of illegals the tests would be very expensive.  

                      If a single parent is found to have committed a crime, say like in Chicago what happens to the child.

                      Answer they go into the custody of DHS, separating the family.