Why do i have hazel eyes (green with an admixture of amber) if all my relatives have either blue or gray eyes. they also all inherited eye color from their parents, but i didn't. why?

Chromosome 15: Eye color is determined by the amount of melanin in the iris... the more melanin, the darker the color. Multiple genes are involved. While a child’s eye color can often be predicted by the eye colors of his or her parents and other relatives, variations sometimes produce unexpected results. REF: https://medlineplus.gov/genetics/understanding/traits/eyecolor/