I see. Thank you for the additional information.
Unfortunately, unless you seek guardianship of the children, the mother
could change her mind at any time and take custody of the girls, so it would normally be best to seek court-appointed guardianship for them.
I am concerned from the facts you provided that the other children may be in danger of neglect if your daughter is abusing drugs or otherwise not dependable. If you have a reasonable suspicion that she is using drugs or is neglecting or abusing them, it would normally be best to contact child protective services to investigate and take action on their behalf if necessary.
You do not indicate which state you live in, but if you would like to provide me with that information, I would be happy to look for information for you to review on the subject of seeking guardianship. Parents have constitutionally protected rights and grandparents do not, but since the girls have lived with you for so long, there would typically be a good chance of obtaining guardianship of them, especially if the mother does not have the resources to contest such a petition.
I hope this helps clarify the situation for you.
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