Halachically, first cousins are permitted to marry each other, hence they have all the regular Dinei Rrvah and then some. Even HaEzer Siman chuf-beis states that relatives have the din of “Libo Gas Bo”, meaning there are some hateiri of Yichud that while applicable in most cases are not applicable for cousins, who have more restrictions than normal. Shulchan Aruch (E.H. 22:8) and the Aruch Hashulchan (E.H. 22:6) present examples of a man and a woman who grew up together or are related – such as cousins.
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