Helen and Frank met a little differently than in the movie. In her book, "Who Gets The Drumstick?"after Helen moved to San Francisco, she wanted to honor her dead husband's wishes by enrolling her children in parochial school. She finally found a school run by a nun, Mother Superior Sister Mary Eleanor. As she was enrolling her children in the school, Helen told Sister Mary that she was a widow with eight children. Sister Mary then confided to Helen that she has a brother with ten children who recently lost his wife to complications from diabetes. Helen asked Sister for Frank Beardsley's address and she sent Frank a copy of a prayer that she clipped out which gave comfort on dealing with a loss of a spouse. Encouraged by her brother and sister, Helen went on a batch of unsuccessful blind dates. When a friend's husband died, Helen wanted to send her a copy of the prayer that she sent Frank. She wrote to Frank asking for a copy of the prayer. Frank sent it back and a correspondence immediately began between Helen and Frank which finally led to another blind date. This time sparks flew between them.
The wedding invitation used in the movie is the actual wedding invitation designed by Frank Beardsley, husband of the real Helen Eileen Beardsley. The children's names are listed in their real-life birth order.
Lucille Ball co-produced the film under her company, Desilu Productions. When the film became a surprise smash hit grossing over $17 million on a $2.5 million investment, she became furious about it. She hadn't anticipated the film's huge box-office success and failed to provide a tax shelter for her personal profits, resulting in most of her share going in taxes.
The wedding scene was filmed in the old Mission Dolores church in San Francisco, California, directly next door to the large, modern church built after the 1906 earthquake. Services are seldom held in the old church, which is more of a tourist attraction.
Loosely based on the book 'Who Gets the Drumstick?' Similar to The Sound of Music (1965), there were a lot of changes made for the movie whereas in the actual book and real life, the children had a better liking to each other right away. Also, Frank and Helen actually had two children together.
When the television show, The Brady Bunch (1969) was in the beginning phases of production, the makers of "Yours, Mine and Ours" threatened to sue claiming that the concept was too similar to their own. The threat was withdrawn, however, when Brady Bunch producer Sherwood Schwartz countered the action with documentation that his original script was shown to have a copyright date before that of the movie. The final evidence that halted any legal proceedings was the fact that the original Brady Bunch title, according to the original draft of Schwartz's script, was "Yours and Mine."