Deport them and permanently revoke their visas.
I think they can be deported even if they've naturalized. Depending on exact circumstances.
There are some things that go beyond the pale and this is one of them. The jerks bought another child and she is currently serving the wife while she waits for her husband to finish up his sentence, I guess.
Shyima has been adopted by an American family and appears to be thriving. She graduated from high school and has become an American with hopes of becoming a police officer.