Alan Lindsay SANDERSON was the son of
1st Baron SANDERSON OF AYOT (1894 - 1971) and Evelyn Constance ISMAY (1897 - 1940), dau of
J Bruce ISMAY (1862 - 1937),
scion of that gentry family f/o Dawpool.
He m 1959 Gertrud (Trudi) BOSCHLER (died 2016) and had issue: 1 son and 4 daus. (some sources, including thepeerage, have misidentified his dau Evelyn as a son)
His only son succeeds him: Michael SANDERSON, (3rd Baron SANDERSON OF AYOT), though it is unknown whether he will prove his claim. He was born 1971, and attended a US university. It is unclear where he is currently resident, though he is listed as unm by Debrett's online.
The heir presumptive, and only heir listed in Debrett's online, is Basil SANDERSON (born 1974), son of Hon Murray Lee SANDERSON (1931 - 2017), 2nd son of the 1st Baron. Basil is shown unm. However, Murray's obit lists him as having 3 grandchildren, none of whom are listed in Debrett's Online, so there is a chance of an heir not known to us.