Blundell was the son of Sir Francis Blundell, 3rd Baronet, by Anne Ingoldsby, daughter of Sir Henry Ingoldsby, 1st Baronet and Anne Waller.
[1] In 1715 he was returned to parliament as one of two representatives for Haslemere, a seat he held until 1722.
[2] In 1720 he was elevated to the Peerage of Ireland as Baron Blundell, of Edenderry in the King's County, and Viscount Blundell.
Their daughter the Honourable Mary Blundell married William Trumbull.
They were the grandparents of Mary Hill, Marchioness of Downshire.