Born in Wimbledon, Weigall was the son of a Victorian artist Henry Weigall (best known for his portrait of Disraeli in 1878–1879) and his wife Lady Rose Fane, daughter of John Fane, 11th Earl of Westmorland.
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A younger brother was Lieutenant Colonel Sir William Ernest George Archibald Weigall, 1st Baronet KCMG, a Conservative MP who was Governor of South Australia.
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