Custodial parents decides if children can go leave country?

Situation: Two parents are divorced and the dad has custody of all the children. Every other weekend the children go spend the weekend with their mom. The children wants to go on a cruise to the bahamas and the dad said yes , they have his consent. Do they have to ask their mom also if they can go on the cruise? Or... show more Situation: Two parents are divorced and the dad has custody of all the children. Every other weekend the children go spend the weekend with their mom. The children wants to go on a cruise to the bahamas and the dad said yes , they have his consent. Do they have to ask their mom also if they can go on the cruise? Or is dads answer enough?
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