No, but in my observations most do. I wonder if his wife was always Episcopalian? What was her background?
When I attended confirmation classes with my husband, the class was pretty much people in two situations. A spouse or fiancée converting so the couple and future children would all share the same faith OR the couple was made up of a Catholic and a Protestant of some persuasion and they had determined that being Episcopalian was sort of middle ground and therefore acceptable to both.