Complete Peerage says that Grace Pelham, wife of Lord Sondes, was born 18 August 1728.
Collins' Peerage of 1812 says she was born in January 1735, and gives the 18 August 1728 birth date to her sister Frances. Other sources about Frances also say that she was born 1728.
Does anyone have access to records showing the correct birth-date or age for Grace?
I have the children of Henry Pelham, the Prime Minister, as:
two sons:
Thomas (1729-28 Nov 1739)
Henry (1736-27 Nov 1739)
six daus:
Lucy, d.6 Feb 1740 in her twelfth year
Catherine (24 Jul 1727-27 Jul 1760); married her first cousin who later became 2nd Duke of Newcastle
Frances (18 Aug 1728-d.10 Jan 1804, per the notice in Gentleman's Magazine, though Collins says 1805)
Grace (Jan 1735-3 Jul 1777), m. to Lord Sondes
Mary (Sep 1739-25 May 1794)
Dorothy, d.an infant ca 1740