👉 In mathematics, a cousinry is a group of people who are related through an ancestor relation. In this context, "cousinries" refers to groups of cousins or relatives that share an ancestor relationship, often based on bloodline or kinship. For example, if you have two cousins, Sarah and Emily, the group they form under this definition would be called a cousinry, as it is based on their shared ancestry. In this case, Sarah could be related to Emily through her
