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Legally, BOTH parents have rights over the child unless and until there is a court order saying something different. As they are still married, she has the right to have the children in her custody and it is not kidnapping
for her to act this way. If the father wants the children or visitation with the children, he would have to seek to file an action in court with a local attorney and it would start by filing for divorce and a motion for temporary custody/visitation orders and would have to get the court to order the mother to comply.
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