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COUSIN, domest. rel. Cousins are kindred who are the issue of two brothers or two sisters, or of a brother and a sister. Those who descend from the brother or sister of the father of the person spoken of are called paternal cousins; maternal cousins are those who are descended from the brothers or sisters of the mother. Vide 2 Bro. C. C. 125; 1 Sim. & Stu. 301; 3 Russ. C. C. 140; 9 Sim. R. 386, 457.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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At the time of enrollment, a detailed record of the required information including the neonate's age, sex, parental consanguinity (1st cousin relation), the mother's age at delivery, venous TSH and T4 level as well as further physical examination were made.
The incidence of b-thalassemia was significantly higher (P<0.001) in 1st cousin marriages compared to unrelated.