In 1873 he married Helen, daughter of Major-general N. J. Gordon, who survived him with two sons, the younger being Wyndham Halswelle.
Born in London to London-born, Edinburgh-trained artist Keeley Halswelle and Helen Marianna Elizabeth Gordon, he is nonetheless usually referred to as being Scottish, the nationality of his maternal grandfather, General Nathaniel J. Gordon.
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On his return, in a single afternoon in 1906 at the Scottish championships in Powderhall, he won the 100, 220, 440 and 880 yards races (91, 201, 402, 805 m), a feat that has not been matched since.
John Wyndham | Wyndham | Windham Wyndham-Quin, 4th Earl of Dunraven and Mount-Earl | Wyndham Hotels & Resorts | Charles Wyndham | Wyndham's Theatre | Wyndham Deedes | Wyndham, Western Australia | Wyndham Lewis | Victoria Wyndham | George Wyndham | Charles Wyndham (actor) | Wadham Wyndham | Wyndham Standing | Wyndham Meredith Manning | WorldMark by Wyndham | Windham Wyndham-Quin, 5th Earl of Dunraven and Mount-Earl | Sir William Wyndham, 1st Baronet | Percy Wyndham (soldier) | Percy Wyndham | City of Wyndham | Wyndham Wise | Wyndham Hills, Pennsylvania | Wyndham Hills | Wyndham Halswelle | Wyndham Guise | Wadham Wyndham (judge) | Thady Wyndham-Quin, 7th Earl of Dunraven and Mount-Earl | Sir William Wyndham, 3rd Baronet | Sir Edward Wyndham, 2nd Baronet |