Middleton had a half sister FILAGREE (ch f 1815 SOOTHSAYER) who was bred to his sire PHANTOM (1808) and produced:
COBWEB (b f 1821 PHANTOM)[a winner of the Oaks Stakes 2414m=12f; and the One Thousand Guineas Stakes 1609m=8f.
Cobweb is an ancestress in the tail female line to the great SPEND A BUCK.