"Family Tree" by Charles L. Fontenay is a science fiction novella written during the mid-20th century. The story revolves around the provocative exploration of evolution, social norms, and what it means to be human in the context of a man who is revealed to be a superman due to his unusual chromosomal makeup. The narrative grapples with themes of societal standards, personal identity, and the implications of genetic mutation. The plot follows Masefield Truggles, a self-appointed moral guardian in the small town of Marston Hill, who aims to confront Blan Forsythe, a man rumored to be practicing polygamy and harboring extraordinary powers due to his unique genetic structure. As Truggles investigates and attempts to rally the town against Forsythe, he uncovers complex relationships with Phyllis Allison, Forsythe's ex-wife, and her son Donald, who holds a mysterious power of his own. The climax reveals that Donald is indeed the product of Forsythe's lineage, possessing an unusual number of chromosomes, which suggests a new step in human evolution. The narrative ultimately forces Truggles to confront his prejudices and insecurities, leading to a deep existential reflection on the nature of humanity and the ethics of evolution. (This is an automatically generated summary.)