Joseph, that is a discussion that centers on whether or not it is a ????. In any case, is only if he is Gd-fearing like his father and the tzibbor wants him. There was one kehilla that had a by-law that no relative of a member could be the rav. When the rav passed away his son-in-law claimed the position but it turned out that he had a relative in the community. If I remember correctly the Chatam Sofer ruled that he could not become the rav.
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