She was a daughter of the courtier Major-General Lord Charles Wellesley.
Her paternal grandfather was the great British general Arthur Wellesley, 1st Duke of Wellington.
The first Lord HolmPatrick was an MP and Irish civic leader.
The future Lord HolmPatrick married Gill Francesca Anne du Feu, the daughter of Squadron Leader Kenneth James (Toby) Harding, on 19 July 1984.
Their son, James Hans Stephen Hamilton (born 6 October 1982), was ineligible to succeed his father in the barony.