1C1R

Writing & Everyday abbreviation · Genealogy

1C1R
Stands forFirst cousin once removed
CategoriesWriting & Everyday

1C1R stands for First cousin once removed, a genealogy abbreviation.

Describes the relationship between a person and their first cousin's child, or between a person and a parent's first cousin, in genealogical shorthand. Similar codes include 2C (second cousin) and 3C2R.

Example: DNA results labeled her a 1C1R, and she turned out to be my mother's first cousin.

Usage notes

Cousin numbers count generations to the shared ancestors (first cousins share grandparents, second cousins share great-grandparents), while "removed" counts the generational gap between the two people. DNA sites and genealogy forums use compact forms such as 1C, 2C1R and half 1C for half-cousins.

More genealogy abbreviations

  • ABT – About
  • admr. – Administrator
  • aft. – After
  • b. – Born
  • bap. – Baptized
  • bef. – Before
  • bet. – Between (date range)
  • bur. – Buried
  • cem. – Cemetery
  • chr. – Christened
  • d. – Died
  • d.s.p. – Decessit sine prole (died without issue)

See all 29 genealogy abbreviations →

Edited by the AbbreviationList.com team. Spotted an error or a missing meaning? Contact us.