https://www.dignitymemorial.com/obituaries/toronto-on/john-davis-8902844
John Gilbert Davis
August 17, 1936 – October 25, 2019
Sir John G. Davis
Born Aug 17, 1936 in London, England to parents Sir Gilbert Davis and Kay White Passed away peacefully in North York General Hospital on October 25, 2019 after a brief illness, surrounded by his loving family. He leaves behind Elizabeth {Libby} his loving wife of nearly 60 years, his children, Wendy (Tom), Linda and Richard (Patricia) and his four grandchildren Spencer, Kendra, Zachary and Elijah who adored their Poppa. He also will be sadly missed by his niece Alison (Roger) and extended family in England. John was born in London, England to parents Gilbert and Kay, and was pre-deceased by his sister Ann, and her son Mark. He immigrated to Montreal in 1957 where he met and married Libby, and raised his young family. [...]
He was the only son of Sir Gilbert DAVIS, 2nd Baronet (1900 - 1973) and Kathleen [Kay] FORD. He married Elizabeth [Libby] Margaret TURNBULL, and had 1 son and 2 dau as in the notice. His son, (Sir) Richard Charles DAVIS (4th Baronet) succeeds him.
My copy of Debrett's 2003 does not list any marriages of the children of the 3rd Baronet, nor issue thereof, but clearly there has been some. Kershaw lists this title as A 1970, indicating that Richard is thought to be the last in line, but if one of the boys is a legitimate son of him, then there are further heirs.