I read the following interesting post online today regarding d'Arquires, which suggests that AC may have another living grandson.
''Aleister Macalpine...aka Charles Edward D'Arquies born May 2nd 1937 (born the day after his planned birth of Beltane day) lived a very unhappy schizophrenic life. I was there in Madron, Cornwall the day he set he set off for London as the Count Charles Edward D'Arquies with Peter Bishop in tow, they stayed at the Dorchester Hotel (1976) His son Aleister Macalpine (born June 20th 1968) is my brother, named after him. We treasure his sad memory and the pressures that were unfortunately bestowed upon him by his father Aleister Crowley. He became a deeply religious man in his later years, and was found living on a park bench, just off the Talbot road in London, with his suitcases neatly organized.''