I am in a lesbian relationship and we have a four-year-old son who is biologically mine. He doesn't have a father and we want to do a formal guardianship or adoption so that he can be on my partner's medical insurance and flight benefits. My mother has threatened to take custody of him just because of the situation, but she cannot prove me unfit. Would she stand a better chance of getting him if my partner had legal rights? Would that hurt me?