Solved
I have had my grandchild for last year while their parents moved to another state and have not paid any support. But they maybe planning on claiming child to get a refund. But I have been supporting her and raising her without legal custody. They do not speak to us.
To be a dependent, a minor child must have lived with the taxpayer more than 1/2 the year. This makes your grandchild your dependent, not the parents' dependent.
If you file first, all will be good.
If they file first and claim her, you should claim her on your return and file by mail (do not efile). The IRS will then sort it out as to who is entitled to the dependent. You should win.
As the child is your grandchild, you do not need any "legal custody" for any of this.
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