Cluster genealogy is a research technique employed by genealogists. In cluster genealogy, researchers look beyond direct ancestors to include the collateral kin (brothers, sisters, aunts, uncles, and cousins), in-laws, friends, neighbors, and associates. Genealogy is the study and tracing of family pedigrees. ...

Cluster genealogy is a time-consuming method of research. Some genealogists utilize this technique only when other methods fail to secure the answer to the genealogical question at hand. Other researchers, however, practice cluster genealogy as a matter of routine in order to better place ancestors within the context of their community.

Further reading

Croom, Emily Anne. 1994. The Genealogist's Companion & Sourcebook. Cincinnati: Betterway Books. ISBN 1-55870-331-4. Chapter 1.

Lenzen, Connie. "Proving a Maternal Line: The Case of Frances B. Whitney." Originally published in the National Genealogical Society Quarterly, 82, no. 1 (March 1994): 17–31. A case study illustrating the use of the cluster genealogy technique.

Rising, Marsha Hoffman. 2005. The Family Tree Problem Solver. Cincinnati: Family Tree Books. ISBN 1-55870-685-2. Chapter 4.