Endogamy PART I
Y DNA – DNAeXplained – Genetic Genealogy
Sibling - Wikipedia
Sibling - Wikipedia
Three-quarter sibling - ISOGG Wiki
Louis Kessler's Behold Blog
Why do half-siblings share 25% of their genes? - The Tech Interactive
3/4 Siblings: You Can Tell the Difference
Sibling - Wikipedia
ISOGG Wiki
Krawczyński – From Shepherds and Shoemakers