Per notes from last year, J. W. Hayter's sister, Jane Mary (1940-), m. 1961, Sir Samuel Charles Whitbread, of Biggleswade, Bedfords., chairman, Whitbread & Co. 1984-92 (director 1972-2001), Lord Lieutenant of Bedfordshire 1991, K.C.V.O., J.P., D.L., F.L.S., F.R.S.A., K.St.J., s. of Maj. Simon Whitbread, of the King's Royal Rifle Corps (60th Rifles), J.P., D.L., and Helen Beatrice Margaret, dau. of Hon. Robert Henry Hepburn-Stuart-Forbes-Trefusis (s. of Charles Henry Rolle Hepburn-Stuart-Forbes-Trefusis, 20th Baron Clinton) and Lady Dorothy Marguerite Elizabeth, dau. of Col Edward William Herbert, of Orleton, Salop., late King's Royal Rifle Corps (s. of 2nd Earl of Powis), and sister of 5th and 6th Earls of Powis.
Her daughter (also 3 s.), Victoria Clare Helen (1969-), m. 1993, Sebastian Finch Morley, s. of Jonathan Derek Morley and Hon. Kirsty Jane, dau. of Sir John William Maxwell Aitken, 2nd Bt; issue 2 daus.