It would really be nice if every MIL/FIL of WA's with children would take a stand about these MLCers actions. Mine swore they would always love me and I would always be their DIL but when push comes to shove, they are accepting OW and ignoring me.
Sucks!
Everything happens for a reason, maybe Dad needs to find that it isn't better out there, he needs to realize how good he had it here. Maybe he will find God and that is the most important thing when he finds Him he will know he is supposed to come home.