In 1778 he married Anne Paterson, daughter of Sir John Paterson, 3rd Baronet and Anne Hume-Campbell, Baroness Polwarth, but they had no children.
He succeeded his father as a baronet in the Baronetage of Nova Scotia on 4 July 1799.
Sir Philip died sine prole.
[1] Lady Anstruther-Paterson died in 1818, her claim to inherit the title of Baroness Polwarth still unresolved.
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