Travis Mayweather's mother, who lives aboard the family's cargo ship, the Horizon.
Rianna Mayweather is the mother of Travis and Paul Mayweather and a member of the crew of the cargo ship Horizon, where her sons grew up. In Horizon, Travis comes aboard to visit her after learning that his father died some weeks earlier.
She gives her younger son a warm welcome and offers him perspective on his place in the family now that he has chosen Starfleet. Her presence helps show the close-knit life of the boomer families who crewed Earth's early cargo ships.