Question

Alan has hemophilia A. His sister, Alice, has one son, Blaine. Blaine also has hemophilia A. Alan and his wife Annette have 2 children, Bart and Barbara. Barbara has a daughter, Cassie, and a son Chip. Cassie and Blaine are married and have a son, Daniel, with hemophilia A. They are now expecting fraternal twins, a boy and a girl.

How are Barbara and Blaine related?
(A) first cousins
(B) first cousins once removed
(C) second cousins
(D) second cousins once removed

Answer 1

Barbara and Blaine are second cousins once removed.

Step-by-step explanation:

In this scenario, Blaine is the son of Alice, making Blaine Barbara's cousin. Alan is Barbara's brother, so Blaine is also Alan's cousin. However, Alan and Blaine are not in the same generation. Alan is the uncle of Blaine. This relationship is described as first cousins once removed.

The children of Alan and Annette, Bart and Barbara, are Barbara's children. Cassie is Barbara's daughter and Chip is Barbara's son. Cassie and Blaine are married and have a son named Daniel, who has hemophilia A. Therefore, Cassie and Daniel are siblings, making Daniel Barbara's nephew. The twins that Cassie and Blaine are expecting will be Daniel's cousins. But again, since they will not be in the same generation, the relationship will be once removed. Therefore, the twins will be second cousins once removed to Barbara.