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No, the picture just failed to capture the true texture of the hair.Curly hair is the result of specific genes. Since the indigenous Africans, who also happen to possess the oldest genetic Haplogroups amongst Humans, seem to have many members with curly hair, it's safe to say the gene that triggers curly hair can manifest in any/many human lineages outside Africa too.
BTW, your Sis doesn't have curly hair, but wavy hair. Many in my family have similarly wavy hair too.