I know I come off like an evil bitch but I'm emotionally worn out.
When my SS was 10, BM took him to her home country for a "holiday" and refused to let him come back unless my DH agreed to change the custody agreement to make her country SS's primary residence. This happened literally three days after our wedding.
My DH tried to fight it for years but he couldn't do much from our country. They never came to an agreement.