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Two sisters are convincing their new middle school teachers that they are, in fact, twins even though they look very different: one is black and one is white.

Eleven-year-olds Marcia and Millie Biggs of Birmingham, England are starting at a new school this year. Classes at King Solomon International Business School begin later this week. The girls’ parents have been meeting their teachers, explaining that their daughters are actually twins, despite their different complexions. Some are shocked to hear it, since Marcia has light skin, blonde hair and blue eyes, while Millie has brown eyes, dark hair and a golden complexion.

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“I’d be picking them up after school, and the other parents would stop me and say: ‘Are they your daughters?’” mom Amanda Biggs told SWNS, according to Inside Edition. “When I told that them that they were twins, they would always be stunned. I notice a lot of people doing double-takes.”

According to the Birmingham Mail, mom Amanda is white while their dad, Michael Biggs, is of Jamaican origin.

Michael said the girls looked almost identical when they were born, but in the months afterward, they started to look more and more different.

“Millie started to suddenly get darker,” he explained, “and we thought that the same would happen to Marcia. I thought to myself: ‘No problem – one black, one white.’ We never worried about it, though, we just accepted it.”

The girls, who are best friends, said they are looking forward to attending a new school and meeting new friends.