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If the parents will not grant you custody or visitation then you have a possibility to seek rights to get the children from the parents by proving the parents are unfit. Under the current status of the laws, grandparents rights are very hard to receive, because the US Supreme Court has stated the rights of the biological parents to make decisions for their child are fundamental rights (basic civil rights) which shall not be disturbed absent a showing the parents are unfit by clear and convincing evidence. See: Troxel v. Granville, 530 U.S. 57 (2000).
So, you could go to court and seek custody of the children based on the parents being unfit and you have to prove drug use and her criminal record to show clear and convincing evidence that the parents are indeed unfit and also the proof of the existing relationship with you would arguably make your custody in the best interests of the children.