What legal rights do step-mothers have in Texas? Medical record/decisions….FRAUD?

My nephew lives with his father (on-going custody battle…very ugly!) the father is married to a woman that is extremely pushy and sticks her nose in EVERYTHING. She has recently signed my nephews medical papers claiming to be my nephews biological mother. (custody is only temp. at this point…and it is shared custody between the father and my sister) We are in Texas….wanted to know if what the step-mother is doing is considered fraud? Contempt of court order? What rights does she really have? (I'm thinking not many rights if any at all!) Any help please!

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