Who is Mrs. Bryson from I'm a Stranger Here Myself: Notes on Returning to America After Twenty Years Away and what is their importance?

Bill is married to a British woman named Cynthia whom he calls Mrs. Bryson throughout the book. Although Mrs. Bryson does not contribute directly to the narrative, she is an important part of the book because she influences so much in Bill's life. Mrs. Bryson takes a leap of faith by moving her young family from England to America but finds that she completely loves the American way of life.