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William Hart-Smith was born in 1911.
William Hart-Smith died in 1990.
Smith Hart's birth name is Smith Stewart Hart.
Smith Hart is 6' 4".
David Hart Smith is the son of Davey Boy Smith, also known as the British Bulldog, who was married to Bret Hart's sister Diana, making D.H. Smith Bret Hart's nephew.
So Easy Answer is yes!