GrandmainOz, I am so pleased you had the courage to help your daughter-in-law escape and I will tell you why:
Two weeks ago today, A young mother of four children was stabbed to death by her estranged husband just 100 yards from my house. She had been living in a "safe house" for the last month, and was under the Police Safeguarding unit, so there had obviously been prior abuse and violence from her husband.
Fortunately, he was caught and arrested a couple of hours later, and will appear at Crown Court in March charged with her murder.
This shocked our neighbourhood to the core, (we are in a nice Surrey area, which rarely has had such a violent event) and as the lady was from Brazil originally, a large sum of money has been raised by the local community to repatriate her body to Brazil, and provide funds to help her family with legal requirements to look after the children.
While your son may not harbour such violent thoughts, it is commendable that you have helped to take your daughter-in-law out of harm's way.
I do agree, though, that legal advice should be sought quickly, on her position regarding taking the children away.
My best wishes go to you and your family.