You searched for: “adelphogamy
adelphogamy
1. A form of polyandry in which two or more brothers have or share the same wife, or wives.
2. Possibly, the marriage of a brother and sister to each other.
3. In zoology, mating of brothers and sisters, as with certain kinds of ants.
4. In botany, fertilization between two different individuals derived vegetatively from the same parent plant.