Saying biology matters, an Arizona woman is making a last-ditch effort in court to keep from being forced to share custody of her child with her former wife.

Keith Berkshire, attorney for Kimberly McLaughlin, is asking the U.S. Supreme Court to overturn last year’s ruling by the state’s high court, which concluded that Suzan McLaughlin had the same right to claim parentage as if she had been Kimberly’s husband.

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