Calimmacil was the son of Arciryas, the younger brother of Narmacil II (T.A. 1684-1856), the 29th King of Gondor. Calimmacil had a son, Siriondil, whose son Eärnil became the thirty-second King (Eärnil II) when Ondoher and his sons had been slain in a battle against the Wainriders in T.A. 1944.
Calimmacil is the son of Arviryas and the father to Siriondil (father to Eärnil 2).