Can a biological mom cover her 21 year old daughter on her insurance policy?

Question Details: The biological mom signed her rights away to the child at 17 due to a forceful unfair custody battle and the stepmom adopted the child. The child returned to her mom the day she turned 18; now she is 21. Her adoptive mom and biological dad refuse to put her on their health insurance. Can the biological mom/stepdad cover her under his family insurance plan coverage? Can biological parents give their income for the FAFSA as they will not give her their information to complete these forms either?

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