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A relative who has with the other person only two grandparents or one grandparent (maternal or paternal) in common, but parents are different.
(figurative, by extension) Anything closely related.
1878, Connecticut Churchman, volume 37, page 246:
[…] that coarseness which is first cousin to sin.
1920, Boys' Life, volume 10, number 4, page 22:
e was afraid the Mexicans, who were, he claimed, first cousin to the spigotties, would catch us off our guard and give us the same treatment.
Usage notes
Starting with two first cousins (two persons with a common grandparent), the relationship between one of those persons and the offspring of the other is first cousin once removed.
The relationship between one of those persons and the grandchild of the other is first cousin twice removed.
The relationship between one of those persons and the great-grandchild of the other is first cousin thrice removed.