He was s of Brian Harrington GRAYSON 1900-89 s of Lt-Col Sir Henry Mulleneux GRAYSON 1st Bt 1865-1951) and his 1st wife Sofia d of George BUCHANAN. He m 1958 Sara Mary d of C F UPTON of Monte Carlo, and had 3 sons and 4 daus. His eldest son succeeds him:
[Sir] SIMON JEREMY Grayson [6th Bt] has yet to establish his claim, b 12 July 1959. He is unm but has issue by _ CHRISOSTOMOU
SON LIVING (by _ Christostomou)
Louis Alexander Harry b 1999 reg Q3 London
DAUGHTER LIVING (by _ Christostomou)
Emily Antigone Mary b 2000
BROTHERS LIVING
PAUL FRANCIS b 22 Nov 1965 m 2001 as her 2nd h Mrs Jacqueline Carol Lane d of Jose Carlos MORESCO, and had a son GEORGE PAUL b 2009, ___ and a son & dau (by Eve PIERI) Sebastian Paul GRAYSON b 1986, m 2016 Emma Elizabeth Yorke d of Mark MADSEN of Gt Chart, Kent and has issue Isabella Elizabeth Yorke b 2018 and Harry William Yorke b 4 June 2019), ___ Sophie Anastasia GRAYSON b 1991.
Mark Christopher b 29 Mar 1968