206.1 There are two ways you and I can be blood relatives. We can be direct relatives, meaning parent/child, grandparent/grandchild, great grandparent/great grandchild, etc. All other relationships are called collateral. And to be related collaterally, one of three things must be true:
1. You and I are descended from a pair of siblings or half-siblings.
2. One of us is descended from the sibling or half-sibling of the other.
3. We ourselves are siblings or half-siblings.
206.2 …which is a roundabout way of saying when confronted with a tangled briar-patch of a family tree, look for siblings!
206.3 And in Chart 743, the siblings aren’t hard to find. So how are you and B related? Checking the left side of Chart 744, your grandfather and B‘s father are brothers (green). The children of these brothers, your father and B, are first cousins (orange). So you and B are first cousins once removed (purple)…B is ascending, you are descending. In Spanish B would be your second aunt, you would be B‘s second nephew.
206.4 On the right side of Chart 744, your father and A‘s grandfather are brothers (green). The children of these brothers, you and A‘s father, are first cousins (orange). So you and A are first cousins once removed (purple)…you are ascending, A is descending. In Spanish you would be A‘s second uncle, A would be your second niece.
206.5 As to how A and B are related to each other…in a complicated tree like this, be on the lookout for multiple ways. To many people, it never occurs to them that two people can be related to each other in more than one way, unless they have such a thing in their family.
206.6 I have a few but very distant, like 6th or 7th cousins. But there are some other interesting connections. Like two of my paternal grandmother’s brothers married a pair of sisters. The resulting offspring were double first cousins to each other, although merely “regular” first cousins to my father. A son of my grandmother’s first cousin married the sister of the man who married one of my father’s sisters. This means that some of my first cousins have first cousins who are also their third cousins, although that relationship doesn’t effect me. And on my mother’s side, my grandmother’s first cousin married the second cousin of our old milkman, the one with the toothpick…just sayin’.
206.7 Anyway, A and B are indeed related two ways. Left side of Chart 745…B‘s father and A‘s great grandfather are brothers. B and A‘s grandfather are first cousins. B and A‘s father are first cousins once removed. B and A are first cousins twice removed.
206.8 On the other side, right side of Chart 745…B‘s mother and A‘s grandmother are sisters. B and A‘s mother are first cousins. B and A are first cousins once removed. In both cases, B is ascending, A is descending.
206.9 BTW…the origin of this quiz is instructive. How is your first cousin once removed ascending (B, here your father’s first cousin) related to your first cousin once removed descending (A, here your first cousin’s daughter)? They are first cousins twice removed, but with an important caveat: This assumes that the 3 of you are in the same family, in this case descendants of the “green” parents, left side of Chart 746.
206.10 But A and B can be related to each other on the “other side”…having nothing to do with you, thru the “yellow” parents in Chart 746. And as such, A and B can be almost anything…center of Chart 746, they are first cousins…right side, they are first cousins twice removed. So let’s be careful out there…
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