It's said that Eda "Goddess of the earth" Putted the women on the islands first to stop El from ruling it all, that's why the Heirachy is ruled by Women, leadership passes from Grandmother to Mother and from Mother to Daughter.
It's said that Eda (Goddess of the earth) created the women of the islands to prevent El from possessing sole power over them, which is why the Heirachy is ruled by women. Leadership of the "Motherhouses" passes from Grandmother to Mother and from Mother to Daughter.