In 1957 he married Anne Phipps Sidamon-Eristoff, a granddaughter of Andrew Carnegie's partner Henry Phipps.
In the first year of operation, the sanatorium was visited by industrialist and philanthropist Henry Phipps, Jr. In 1903 with a generous donation, Flick opened the Henry Phipps Institute for the Study, Treatment, and Prevention of Tuberculosis in Philadelphia, PA.
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As First Lord he was heavily involved in planning both the successful expedition against Copenhagen in 1807, and the disastrous one to Walcheren in 1809.
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In 1794 he was granted a British peerage as Baron Mulgrave, entering the House of Lords, and in 1796 he was made Governor of Scarborough Castle.
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In 1793, due to the fact that he was on a mission to the King of Sardinia in Turin, he was near at hand when British forces captured the French port of Toulon, and he briefly took command of the British land forces there, before withdrawing upon the arrival of more senior officers.
In 1905 daughter Amy (1876–1959) married Frederick Edward Guest, the grandson of the seventh Duke of Marlborough and Winston Churchill's first cousin.