Sentence 1: The son of Ratcliffe married the scientist W. Grey Walter , and one of his two daughters was the neurophysiologist Nicholas Walter , whose grandson Francis Ratcliffe was .
Sentence 2: Ratcliffe 's son married the scientist W. Grey Walter , and one of his two daughters was the neurophysiologist Nicholas Walter . Francis Ratcliffe was his grandson .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?