Baron Hillingdon

The title was created with remainder to the heirs male of the grantee lawfully begotten.

[2] When he died the titles passed to his eldest son, the second Baron, Charles William Mills.

Edith Mary Cadogan, daughter of the Viscount Chelsea, whose sister married The 10th Duke of Marlborough.

When he died the titles passed to his eldest son, the fourth Baron, Charles Hedworth Mills, who died on 6 May 1978,[5] The title then passed to the third Baron's first cousin, Patrick Charles Mills, son of Geoffrey Edward Mills, sixth son of the first baron.

Hillingdon Court, built by Sir Charles Mills, 1st Baronet in 1858, served as the preferred family home until it was sold in 1919.