I bought Elizabeth At 90, the documentary this snippet is from, when it first came out. It's absolutely wonderful. Each family member who participated provided lovely stories and background . Lady Sarah's section was to do with her mother and how close the two sisters were. It was fun seeing them playing and singing together and being with their parents and Lady Sarah's comments added so much.

I would also recommend watching the sections with Anne in them. She was a hoot and a half.