The titles were then held by his half - brother , Alan Brooke 's younger son , also named Alan .
Field Marshal Lord Alanbrooke was succeeded by his elder son , Thomas , who was unmarried and had no children .
The titles were then held by Alanbrooke 's half - brother Field Marshal Lord     's younger son , also Field Marshal Lord Alanbrooke .
Field Marshal Lord Alanbrooke was succeeded by his elder son , Thomas , who was unmarried and had no children .