In 1916, Nicholson married Jaqueline Louise Rachel (1889-1972), daughter of Adrian Charles Francis Hope, descended from the
Earls of Hopetoun, subsequently changing his surname to Hope-Nicholson by
deed-poll. Jaqueline Hope-Nicholson was a
genealogist, heraldic artist and impassioned costumier dealing with vast outdoor pageants and innumerable amateur theatricals but her greatest interest was in the Stuart kings, primarily Charles II. They separated amicably in 1937. Their children were the artist Mary Lauretta Jaqueline Carola Desirée Valentine Esmé ('Lauretta', 1919–2005) who married the artist
Jean Hugo in 1949 and worked as an assistant editor on the Burlington Magazine and with
Richard Buckle on his publication 'Ballet'; Marie-Jaqueline Albertine Dorothea Beatrice Alexina Romaine Adriana (9 August 1922 – 17 May 2010; married in 1945 war correspondent (Herbert) Maurice Lancaster and had two daughters), who compiled
Brian Howard: Portrait of a Failure in 1968, about
Brian Howard; and (Charles)
Felix Otho Victor Gabriel John Adrian (1921–1990), genealogist and antiquarian. ==Couplet==