Mary married George Wyndham, 1st. Baron Leconfield on 25 Apr 1815 in St. George's, Hanover Sq. Middlesex, England. George (son of George O'Brien Wyndham, 3rd. Earl of Egremont and Elizabeth Ayliffe) was born on 5 Jun 1787 in St. James's, Middlesex, England; died on 18 Mar 1869 in Petworth, Sussex, England; was buried in Bartons Lane Cemetery, Petworth, Sussex, England. [Group Sheet]

1. Blanche Julia Wyndham was born on 21 Nov 1826 in Brighton, Sussex, England; was christened on 1 Jan 1827 in Petworth, Sussex, England; died on 31 Jan 1918 in Marylebone District, Middlesex, England.
2. Caroline Sophia Wyndham was born about 1830; died in 1852.
3. Henry Wyndham, 2nd. Baron Leconfield was born on 31 Jul 1830; died on 6 Jan 1901 in St. George's, Hanover Sq. Middlesex, England.
4. Hon. Percy Scawen Wyndham was born on 30 Jan 1835 in Petworth, Sussex, England; was christened on 2 Jul 1835 in Petworth, Sussex, England; died on 13 Mar 1911 in East Knoyle, Wiltshire, England; was buried on 18 Mar 1911 in St. Mary's, East Knoyle, Wiltshire, England.