She bore two children by the Duke: a daughter, Caroline St Jules, and a son, Augustus (later Augustus Clifford, 1st Baronet), who were raised at Devonshire House with the Duke's legitimate children by Georgiana.
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His stately furniture designs complemented his interiors: he designed furnishings for Hampton Court Palace (1732), Lord Burlington's Chiswick House (1729), London, Thomas Coke's Holkham Hall, Norfolk, Robert Walpole's pile at Houghton, for Devonshire House in London, and at Rousham.