Bill and Lily are pregnant with their second child and Bill just found out his mother is suffering from Huntington's dis

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Bill and Lily are pregnant with their second child and Bill just found out his mother is suffering from Huntington's disease. Huntington's disease is a dominant disease, but symptoms don't show until past the reproductive years. They have 1 child already. No one in Lily's family has it. He wants to tell his wife the odds that neither child will develop the disease.