While the 3 minors are US citizens, their parents are not and the parents can be deported because they are in the country illegally. That means you have the following options: a) deport nobody, i.e. you don't apply the law b) deport just the parents. What do you do with the minor children? Separating them from their parents (different countries) would be cruel. c) deport the entire family, including the US minors. Si…
Illegally immigrating to the US is a civil violation, not a criminal one, and far less of a threat to US safety than going 5mph over the speed limit or running red lights. It is entirely lawful for the executive and judicial branches to use discretion and compassion in cases when under-18 US citizens are involved.