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Yes. In NY, age of consent for sexual relationships is 17, and custody jurisdiction ends at 18.
As far as parental financial support obligations, those extend to 21 potentially, but being self-supporting and in a domestic partnership probably qualifies as "emancipation", in which case, you're on your own.
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Yes, the 19-year-old can marry or enter into a domestic partnership. No, the parents cannot press any charges just for marrying the 19yo.
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