Give reason why a girl and her first cousin are related, but less related than the girl and her brother.

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Please find below the solution to the asked query:     

Brother and sister are more closely related (case A). It is because they have common set of parents and hence share half of their DNA. They have the same set of genetic material, half from father and half from mother. As the family relation gets distinct,the number of genes they share also gets reduced.

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