Henrietta Lowe married Captain Vansittart of the Royal Navy sometime before 1855. The exact date and circumstances of their marriage remain unknown. This union would later play a role in Henrietta's exposure to naval technology and her subsequent invention.

As the wife of a naval officer, Henrietta likely experienced a life involving travel, social engagements, and the challenges inherent in being connected to a service member. This experience would bring her into contact with other officers and engineering experts of the time.

There are no records of Henrietta Vansittart having any children. Further research is necessary to confirm or deny children.