Cavendish was born in Waterpark,
County Cork, Ireland, in 1794. He was the second son of
Richard Cavendish, 2nd Baron Waterpark and Juliana Cooper.
Sir Henry Cavendish, 2nd Baronet, was his grandfather. His elder brother
Henry Cavendish, 3rd Baron Waterpark succeeded their father in the family titles. His sister Sarah Georgiana Cavendish married
Sir George Philips, 2nd Baronet. His sister Catherine Cavendish married Bishop
Thomas Musgrave. On 22 July 1841, he married Elizabeth Maria Margaret Hart at
Uttoxeter.
Mount Cavendish in
Christchurch's
Port Hills was named by a marine survey party in early 1850 after Richard Cavendish. ==Personal life==