The term CALLIOPE RELATIVE refers to the nine Greek MUSES, the daughters of Zeus and Mnemosyne. The crossword solutions for this term are ERATO (5 letters), MNEMOSYNE (9 letters), MUSES (5 letters), ORGAN (5 letters), MUSE (4 letters), URANIA (6 letters), STEAM (5 letters), and THALIA (6 letters). ERATO was the MUSE of lyric poetry, Mnemosyne was the mother of the MUSES, the MUSES were goddesses of the arts and sciences, ORGAN was the MUSE of epic poetry, MUSE was the generic name for any of the MUSES, URANIA was the MUSE of astronomy, STEAM was the MUSE of history, and Thalia was the MUSE of comedy and pastoral poetry.