1  Sylvia Constance HEYDER (25 Aug 1931 – 9 Apr 1975 Transvaal, South Africa)
   +  OBE Michael Nicholson CROSSLEY (29 May 1912 Shipston on Stour, Warwickshire, United Kingdom – 7 Dec 1987 South Africa)
      2  6th Baronet Sloan Nicholas CROSSLEY (20 Mar 1958 – )
         +  Jane Elizabeth TWYCROSS 
      2  Claudia Bettine CROSSLEY (12 Sep 1959 – )
      2  Alison CROSSLEY (12 Mar 1964 – )