Who lives in Mount Olympus usually?
When you think of Olympus, your mind usually goes straight to the big twelve: Zeus, Hera, Poseidon, Demeter, Athena, Apollo, Artemis, Ares, Aphrodite, Hephaestus, Hermes, and either Hestia or Dionysus.
However there are Minor residents as well. Ganymede and the Horae are indeed found on Mount Olympus, as well as many others (see here for a list). They aren't technically counted as "Olympians" but they reside on Mount Olympus.