How many siblings did he have and what were there names ? thanks
James Boswell had two siblings who survived through infancy:
John Boswell (1743-1798), who became a lieutenant in the army, but who had to resign at the young age of 20-21 because of some sort of mental disorder which affected him for the rest of his life. See http://www.jamesboswell.info/biography/john-boswell-brother-great-biographer
David Boswell (1748-1826), who travelled to Valencia at a fairly young age to become a merchant, but later returned to England. See also http://www.jamesboswell.info/biography/thomas-david-boswell
He also had at least one other sibling, who died in infancy. The details escapes me just now, but I seem to recall that Alexander Boswell and his wife Euphemia (Boswell's parents) had a daughter named Veronica in 1741-1742 who died no more than 1-2 years old.
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On his Grand Tour of Europe in 1764-1765, Boswell visited and befriended the famous philosophers Jean-Jacques Rosseau and François-Marie Arouet (Voltaire), and back in Edinburgh he was a personal friend of David Hume.