Anyway, it's not interesting, the only thing the parents are responsible for is having a second child and breaking the law. What people do to enforce the law is their responsibility not the responsibility of the parents that broke it, the same applies for the murderer on death row.
Just because something is legal doesn't absolve you of responsibility. The same way soldiers "just following orders" are responsible for the actions they commit at the behest of their superiors. Both the superiors and the soldiers are responsible