My sister gave birth to a red-haired daughter. But she and her husband are both dark-haired. No one in our family has red hair. My sister insists that her husband's great-grandfather was red-haired, and that's how it was passed down. Her husband didn't believe her, especially since she has this one red-haired colleague at work. Anyway, he insisted on a DNA test, which they did after huge fights and screaming matches. My sister threw the paper in his face. It showed 99.9% he's the father. But he still doesn't believe it, says the test could have been faked or someone paid off the lab. He wants to do another one at a different lab, but my sister is afraid this will definitely lead them to divorce He's not even talking to my sister right now. But he says it's better to find out the truth and live with a clear conscience. He doesn't want to raise someone else's child. I believe my sister 100%, but I have to admit the situation is pretty bizarre. Does anyone know anything about genetics?