On 7 September 1794, 17-year-old Mary married Thomas Reibey, after he had proposed to her several times; she finally agreed to marry the junior officer on the store ship "Britannia". Reibey also used the surnames Raiby, Reiby and Reibey interchangeably, but the family adopted the spelling Reibey in later years. Thomas Reibey was granted land on the Hawkesbury River, where he and Mary lived and farmed following their marriage. They built a farmhouse called Reibycroft, which is now listed on the Register of the National Estate.