The actual facts are that out of 46 realms, there are only thirteen realms ruled by a family with multiple rulers. That is, only five families (Foxglove, Ketchum, Beatrix, Pryde, Abjur) with two rulers and one family (Altenahr) with three rulers. Specifically, Sirion-Westgard, Morek Empire-Nivemus, Avernus-Eponllyn, Astrum-Nothoi, Angmar-Redhaven with double rulers and Gothica-Arnor-Grehkia with a triple ruler.
