Actually, it was a terrible match, from what I hear Felix was NOT happy with the match. Sheremetiev was some 11 years older than precious Bebe', and he had had TB for some time and at the time it wasn't sure if he would be completely cured. After he was declared cured, they were married in 1938, she a sweet young thing of 23 and he a man of 34. They had only one child, a daughter. Shemeretiev is buried with Bebe, but also with Irina, Felix and Zenaida, in the same tomb in Paris.
I really don't think the Yussoupov family was happy with the match at all. If Greg King can elaborate with more information that would be great, it was in his book I first read of Felix's displeasure with the match.