Paid for by Westinghouse, it's a promotional effort for that company and its exhibit at the New York World's Fair of 1939.
Prior to 2015, this is the earliest film from which both the leading man and leading lady were still alive. Marjorie Lord (Babs Middleton) died on November 28, 2015 at the age of 97 while Jimmy Lydon (Bud Middleton) died on March 9, 2022 at the age of 98.
Although they are listed as Father, Mother, Grandma and Maid in the credits, the characters are named as Tom, Jane, Mrs. Harrison and Elvira respectively in dialogue.