George, the Deans would have settled in and/or around the Kansas City area.
When Millvina came over here, on the QE2, in August 1997, her "Post-Tour" Guide was the (now-deceased) travel coordinator from Kansas City.
He showed her the various places that would have been part of her life, had the family made it to Kansas City; that included Millvina meeting distant relations.
One can only wonder what would have happened, if the family made it to Missouri/Kansas, to live.
BTW, one of Millvina's favorite stories, from the Kansas City area, was that of Jessie and Frank James.
I heard about Millvina's interest, and made sure to send her a "WANTED!!" poster, about the James brothers, during a visit to the Smithsonian Postal Museum in Washington DC; saw the poster in the Museum's Gift Shop.
I sent a copy to the travel agent/coordinator, in Kansas City. He recommended that I send one to Millvina; assured him I had done just that.