In 1770, he married Anne Miller, daughter of Sir John Miller, 4th Baronet by whom he had a son, William Charles (1772–1849).
Alexander II had decided to partition the lordship between the Anglo-Norman husbands of Alan's three living daughters, Roger de Quincy (married to Ela), John de Balliol (married to Derborgaill) and William de Forz (married to Cairistiona).
Renowned for his taste in arts, he moved to London to seek his fame and fortune at the Royal Court, where he met his ‘patron’, William Charles Keppel (1772-1849), 4th Earl of Albermarle.
The Castle and the Honor of Holderness passed on the death of William de Forz in 1241 to his son William de Forz, 4th Earl of Albemarle (died 1260).
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Admiral of the Fleet Sir Henry Keppel, GCB, OM (14 June 1809 – 17 January 1904) was a British admiral, son of the 4th Earl of Albemarle and of his wife Elizabeth, daughter of Lord de Clifford.