Isabella Burns (Isabella Begg) (1771–1858) or Isobel Burns (Isobel Begg) was the youngest sister of the poet Robert Burns, born to William Burness and Agnes Broun at Mount Oliphant Farm on the 27 June 1771 and christened on 2 July 1771 by Rev. William McGill, a friend of her father. When she died she was the last member of Robert Burns's immediate family and when living at Bridge House in Alloway for the last sixteen years of her life she entertained many visitors who were interested in his life and works. She was the source of many published insights into Burns's life, character and loves. Her siblings knew her as 'Isbal'.

Gilbert Burns (1760–1827), the younger brother of Robert Burns the poet, was born at Alloway. He married Jean Breckenridge in 1791, had six sons and five daughters, died in 1827, aged 66, and was buried at Bolton, East Lothian, Scotland. Gilbert's writings have contributed greatly to the bank of knowledge that exists regarding the life of his famous brother.