Married Mary Deas they had 2 children
Mary married George Cheap
Peter died 1756
PETER WEDDERBURN
He was a Sir and a lord of session as Lord Chesterhall
He married Janet Oglivy daughter of Captain David Oglivy
and they had 1 son
Alexander 13/2/1733-3/1/1805
ALEXANDER WEDDERBURN
He became 1st Ear of Rosslyn, Lord Chancellor of Great Britain, and was Patron of the livings of Knaresborough and Elvington.
He was born in East Lothian Scotland
1763 Became King's counsel and a Bencher at Lincolns Inn, London
He obtained a considerable amount of money £10,000 on his marriage in 1767 to Betty Anne, sole child and heiress of John Dawson of Manly, Yorkshire.
1780 He was created Chief Justice of the Court of Common Pleas with the title of Baron Loughbrough
1781 His wife died, they had no children
1782 Married Charlotte, youngest daughter of William Courtenay, Viscount of Powderham
They had a child but he died as an infant.
They also had David died at Barrock in 1773 unmarried (Brigadier-General)
and Janet died in 1797 she married in 1761 to Sir Henry Erskine
Lord Loughbrough obtained in 1795 a re-grant of his Barony with remainder to his nephew James St Clair Erskine.
At the end of his tenure as Lord Chancellor in 1801 he was granted an Earldom (of Rosslyn) with the remainder to his nephew and he had a pension of £4000 per annum
It appears that he chose Rosslyn as his title because he intended for his Earldom to be inherited by his nephew, who had inherited Rosslyn through his father's mother.
After this date he rarely appeared in public, but attended Royal Festivities. He accepted an Honorary Vice President of London's charitable Foundling Hospital in 1799
He attended a festive gathering at Frogmore in Dec 1804. The following day he was seized with an attack of gout in the stomach, and on the 2nd January 1805, he died at his seat at Baylis, near Salt Hill, Windsor.
His remains were buried in St Paul's cathedral on the 11th January 1805