When Thomas Beattie III was born on 12 September 1861, in Ormstown, Châteauguay, Quebec, Canada, his father, Thomas Beattie II, was 29 and his mother, Annie Hooker, was 25. He married Rebecca Ainslie on 21 December 1887, in Comber, Lakeshore, Essex, Ontario, Canada. They were the parents of at least 5 sons and 4 daughters. He lived in Mersea Township, Essex, Ontario, Canada in 1881 and Essex, Ontario, Canada for about 10 years. In 1911, at the age of 50, his occupation is listed as merchant in Essex, Ontario, Canada. He died on 28 May 1944, in Comber, Lakeshore, Essex, Ontario, Canada, at the age of 82.
Scottish and Irish: variant of Beatty 1.
Scottish: variant of Beatty 2.