Katherine was the daughter of unknown parents. The date and place of her birth have not been found.
Her husband was William Wellesley-Pole William Wellesley, who she married in 1784. The place has not been found. They had no known children.
Note 1
daughter of Admiral John Forbes and granddaughter of the George Forbes, 3rd Earl of Granard and of William Capell, 3rd Earl of Essex