Parker was born at Arwarton, Suffolk, the son of Sir Philip Parker, 2nd Baronet, and Mary Fortrey. He took the name of Long on inheriting the estate of Whaddon in Wiltshire from his great-uncle Sir Walter Long. The original Coat of Long was, through some error, allowed to him by the College of Arms.
On 11 July 1715 Parker married in London, Martha East and they had four daughters:
- Martha (1716–1775) married John Thynne Howe, 2nd Baron Chedworth
- Elizabeth (1717–1757)
- Katherine (b. 1719)
- Dyonisia (b. 1722)
On 20 January 1741, John Perceval, 1st Earl of Egmont wrote in his diary:
"This morning died my brother-in-law Sir Philip Parker, at 3 o'clock, choked by one of those fits he has had for 12 weeks past at sundry times."
- "PARKER, Sir Philip, 3rd Bt. (1682-1741), of Erwarton, Suff". History of Parliament Online. Retrieved 15 August 2018.
|Parliament of Great Britain|
Carew Harvey Mildmay
| Member of Parliament for Harwich
With: Thomas Heath 1715–1722
Humphry Parsons 1722–1727
The Viscount Perceval 1734–1741
|Baronetage of England|
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