I totally understand you not wanting to get dragged into the legal details of the situation, but I second the PP who recommended you at least talk to a lawyer in Hawaii who specializes in these kinds of cases, just to know your rights and what your son needs to think about doing. I'm sure the Power of Attorney thing sounds like a hassle, but if his ex is determined to make it difficult for him to have the baby too, it's best that there be a legal paper trail to you so child welfare in Hawaii can have an easier time placing the infant with you if it comes to that.
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In other words, it's a good idea to try to talkt o someone who can tell you all of the likely scenarios that could happen and how you should best position yourself to deal with them (hopefully it's looking good for your son to just have custody, although was his wife a stay at home mom and who would keep the baby then?)Â Even if mom is found to have used drugs while parenting (sounds like that's already been established through the breastmilk finding), she still has rights to visitation (unless the courts decide otherwise) which would mean even if your son wants the child placed with you out of state, the mother has a right (and a very strong right) to object to that and insist that the baby stay in Hawaii.
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I hope in the end it turns out you don't have to think about all this and yoru granddaughter is safely and stably placed somewhere great (with you or otherwise) and things go more smoothly than expected. But for me, I always like to have the best idea I can of just how badly things can go as well and at least start some preliminary thinking about what my options might be and what I need to be ready for.
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Good luck, let us know what happens!