Be on the look out for the mother of Rarus. She is cited by Pausanias in 1.14.3 as the daughter of Amphictyon but otherwise unnamed. Pausanias 1.14.3 says that Cecyron and Rarus are brothers through their mother; however, I can't find evidence that specifies who their mother is other than in Epitome 1.1.3 which says "Cercyon, son of Branchus and a nymph Argiope."