That's ridiculous. The man planned to take the kids in advance. He kept his plans secret. He made sure that he was over the border before he told anyone where he was. The kids didn't know of the plan and nor did the mother. They had no opportunity to say goodbye to their mother, and will never see her again. They had no choice in the matter, and he paid htem no consideration. He's made it quite clear that the mother is at risk if she makes any attempts to return to find her children.
Yup, "the father took his own kids". Say that if you like. It doesn't change the impact of what's been done at all.
Clearly you've made your mind up on the matter but to say the children will never see their mother again is bordering on the hysterical. And I notice that once again in all of this, the man has been judged and found guilty before all the facts (other than the subjective ones we have from you) are in.