Three Du-For Boys

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The English boys mostly work as a trio, but they indulge in the occasional solo.
"I'm At Your Service, Sir"
Their aunt was in the back row, cued up to start the applause each time. However, she seemed to be distracted at some point, where the audience took up her responsibility.
They did very well, and their stepping looks good.
Source:
Variety, vol. 42: 8. 21 April, 1916