Commonly, "cousin" refers to a "first cousin", people whose most recent common ancestor is a grandparent.A first cousin used to be known as a cousin-german, though this term is rarely used today.. More generally, cousin is a type of familial relationship in which people with a known common ancestor are both two or more generations away from their most recent common ancestor.
History. According to Professor Robin Fox of Rutgers University, 80% of all marriages in history may have been between second cousins or closer. The founding population of Homo sapiens was small, to 10, individuals; therefore, a certain amount of inbreeding is inevitable. Proportions of first-cousin marriage in Western countries have declined since the 19th century.
Jun 18, · Queen Elizabeth II's cousin, Lord Ivar Mountbatten, announced that he will marry his partner James Coyle this summer in the royal family's first same-sex .