This sub-series comprises correspondence from a number of Mary Hamilton's relatives: her cousin Rev. Archibald Hamilton Cathcart (HAM/1/5/1); Mrs Wilhelmina Murray, Miss Elizabeth Murray and Miss Ann Murray (HAM/1/5/2); Robert Fulke Greville and Charles Francis Greville (HAM/1/5/3); and Lord and Lady Warwick (HAM/1/5/4).
The correspondence relates to both family matters and general news of wider society and friends including the Royal family. The correspondence from the Murrays (HAM/1/5/2) includes details of society and Royal gossip, including the gambling and drunkenness of the Prince of Wales, the return to health of George III and the ensuing public celebrations, society marriages, and presentations at Court including that of a Mrs Drummond. Drummond was very tall and had large feathers placed in her hair as decorations. When she bent forward to kiss the Queen's hand, the Queen had to hold her head back and stretch her hand as far forward as she could to prevent the feathers brushing her face (HAM/1/5/2/8).
HAM/1/5/4/1 is an architectural plan of Lady Warwick's house in Mansfield Street, London, dated 1775. A note on the plan states that the whole building is designed with arches and 'is the first & only one so built in London this year'.