Princes William and Harry formed a human chain to unload sandbags from an Army vehicle as they joined colleagues from the armed forces in helping to defend Datchet from the floods.
The private visit was unannounced but once news of their work spread, they were followed by journalists and cameramen.
Asked by ITV News whether he was enjoying helping, Prince Harry replied: "Not really with you guys around".
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Marjorie and Michael Cawdery, both 83, are understood to have been stabbed to death in a killing their family called "incomprehensible".
Detectives have launched a murder investigation following the shooting in Brent, north west London on Friday night.
Hot and humid throughout the Bank Holiday Weekend.