Three-quarter sibling - ISOGG Wiki

Sibling - Wikipedia

Why do half-siblings share 25% of their genes? - The Tech Interactive

Autosomal DNA statistics - ISOGG Wiki

International Society of Genetic Genealogy - Wikipedia

Tracking DNA segments through time and space - Cruwys news

Family tree - Wikipedia

Transitive relations, genetic genealogy and FTDNA's chromosome browser

Genealogical DNA test - Wikipedia

Cousin - ISOGG Wiki Family tree genealogy, Genealogy chart, Cousin relationships

Do cousins have the same amount of DNA as siblings? If not, how different are they? - Quora

Cousin statistics - ISOGG Wiki