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The court must consider the best interests of the children in determining whether to allow her to move out of state. If it is for a job or other legitimate reason, the court usually grants such requests, but would order her to pay the additional costs of transportation for visitation.
As a grandparent, you may try to intervene in the case since the children have lived with you since they were born. You could request visitation or even custody if there is a good basis for it, but you would need to retain an attorney and counselor for the children to determine that visitation or custody would be in the best interests of the children.
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