Hestia and Hera were sisters. Both of their parents were Cronus (or Kronos) and Rhea. They are both Greek goddesses, and both their names start with the letters "he".
Hera was youngest, Demeter the middle daughter, and Hestia the eldest, but they came out in order of most recent birth when Zeus disgorged them from Cronus, so Hera would then be "elder", Demeter...