Thomas Renwick was one of four known children of Herbert Renwick and Elizabeth Brown all of Park of Dumgree, Dumfries, Scotland.
Herbert Renwick 1813
Janet Halliday Renwick 1814
John Brown Renwick
Thomas Renwick 1818
Thomas studied medicine and graduated from Edinburgh University as Doctor of Medicine in 1838. He practiced as a doctor for a short time in Kent, England, but his aspirations lie further afield and he wanted to live abroad. He realised a way of emigrating at little expense by being employed as a ship's surgeon on an immigrant ship and he signed on to the 'Thomas Harrison' which left from Gravesend in late May 1842.
He married Adeline Absolon in 1846. Adeline had money of her own, in trust, and when land in the Awatere became available she bought up 20,500 acres, and they named it Dumgree. Adeline was not happy living in New Zealand and she returned to England to live, Thomas did not want to live in England, and their marriage ended. Adeline died in 1870.
Thomas then married Anne Smith in 1872. Anne had migrated to New Zealand on the 'Cissy' with her mother.
Thomas although married twice did not have any children of his own, however he and Anne took great interest in close family members.