If you run multiple nodes, all nodes must reference all sibling nodes - forming a so called family. This is used by clients so that each circuit only uses at most one of the nodes in each family. Otherwise, if more than one node of a family is used, the admin of these nodes might be able to gain insights into the user's traffic.

This search term uses one of the nodes' IDs and queries for all nodes that belong to the same family - i.e. nodes run by me.