Linked from
The 13 pages that link to Genetic genealogy, each with the reason it gives.
Genetic privacyRelated: A database match can expose relatives who never submitted their own DNA.
GenomicsRelated: Genome databases have enabled identification through distant biological relatives.
Genetic variationRelated: Shared variants can provide evidence about ancestry and relatedness.
Human genomeRelated: Comparing genomic variants can reveal patterns of shared ancestry.