Who were Orpheus' sister?

Orpheus had several siblings, but the most notable among them were the Muses, specifically Calliope, who is often regarded as the Muse of epic poetry. In some myths, he is also associated with the Thracian princesses known as the "Muses of Thrace." However, his family background varies between different sources, with some emphasizing his divine lineage and connections to various mythological figures. Ultimately, Orpheus is primarily celebrated for his own artistry and tragic tale rather than his siblings.