I always thought Alexis' red was more like Martha's where as Meredith had a darker red, but I never really paid attention to her
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My grandma's twin was a red head, and than no other red heads but my cousins baby was born with red hair (now it's more of a strawberry blonde though like her dad and mom mixed). Genetics always confuse me because brown hair which is typically dominate yet everyone in my family whose married someone with blonde hair all of their kids have ended up with blonde hair and big blue eyes