Atticus, Jack and Alexandra are brothers and sister. Alexandra married Jimmy and the two of them live at the family homestead, Finch's Landing.
Aunt Alexandra and Uncle Jimmy are directly the aunt and uncle of Scout and Jem. Scout and Jem's cousin Henry, Alexandra and Jimmy's son had his own child Francis:
Aunty and Uncle Jimmy produced a son named Henry, who left home as soon as was humanly possible, married, and produced Francis. Henry and his wife deposited Francis at his grandparents' every Christmas, then pursued their own pleasures.
Although Francis is the same age as the children, he is not their first cousin. He is their second cousin. He is Atticus' great nephew.
Jack is Atticus' brother and the favorite uncle of the children. Jack has no children.
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