On 16 February 1755 he had married his second cousin Anna Bosanquet, the daughter of Samuel Bosanquet. Their first son, also Peter, was born on 19 January 1756, their daughter Jane on 24 February 1757, and their son Samuel Robert on 27 February 1759. The eldest son, Peter, was buried in the North choir of St Helen's Church, Bishopsgate on 3 November 1781. Peter himself died on 20 November 1788 and was buried in the chancel of the same church on 28 November. A funerary monument depicts a woman, probably Charity, holding a medallion portrait of Peter Gaussen, and with three children below.
Their third-born son, Samuel Robert Gaussen (1759–1812) was MP for Warwick (1796–1802) and a collector of the works of prominent landscape painter Paul Sandby. Peter bought Brookmans Manor in Hertfordshire as a gift for Samuel in 1786.
↑The registers of St. Helen's Bishopgate, London, ed. W. Bruce Bannerman (London, 1904), p.192.
↑The registers of St. Helen's Bishopgate, London, ed. W. Bruce Bannerman (London, 1904), p.85, 86, 87.
↑The registers of St. Helen's Bishopgate, London, ed. W. Bruce Bannerman (London, 1904), p.393.
↑Minnie Reddan and Alfred W Clapham, St. Helen's Bishopsgate: Monuments within the church, in Survey of London, Volume 9, the Parish of St Helen, Bishopsgate, Part I (London, 1924), pp. 52-79. British History Online
↑The registers of St. Helen's Bishopgate, London, ed. W. Bruce Bannerman (London, 1904), p.395.
↑Minnie Reddan and Alfred W Clapham, 'Plate 71: St Helen's, Bishopsgate, monuments', in Survey of London, Volume 9, the Parish of St Helen, Bishopsgate, Part I (London, 1924), p. 71. British History Online .
↑Minnie Reddan and Alfred W Clapham, St. Helen's Bishopsgate: Monuments within the church, in Survey of London, Volume 9, the Parish of St Helen, Bishopsgate, Part I (London, 1924), pp. 52-79. British History Online