Sure, as I said, her father was Xenia and Sandro's oldest son, Andrei Alexandrovich. He had three children by his first wife: Michael, who lives in Australia, Andrei, who lives in the US, and Xenia, who died a few years back. After his first wife died, Andrei married for a second time. He lived in the UK by then and married, as I said, Nadine McDougall.
It does get confusing because of Andrei Alexandrovich's second family came to be about the same time as when his son Andrei Andreivich was marrying and having a family in the US. AA's first child, Dmitri, was born in 1953 while his sister, Princess Olga, was born in 1950! (Making Olga an aunt at age 3!).
These type of age issues can happen in any family. I have an uncle who is 2 years younger than I am! But, I can understand your confusion. As far as I know, Andrei Andreivich's adult children do not use any titles whatsoever.
