Old multiple-child movie beats new multiple-child movie

Reporting on the burgeoning trend of too-many kid movies: I thought the too-many kid genre had ended with Cheaper by the Dozen and their credibility-stretching 12 kids.
Well, this holiday season saw not one, but two movies based on 10+ kid families, the sequel to Cheaper by the Dozen (creatively named Cheaper by the Dozen 2) and Yours, Mine, and Ours, which upped the ante by having a record-total 18 kids.
Now, I know many of you are asking who won this battle of the multiple-child-movie titans? Well, despite having 6 fewer kids, Cheaper by the Dozen 2 has won both the critics and the audiences over. Cheaper by the Dozen 2 has scored a robust 9% rating from rottentomatoes.com, whereas Yours, Mine, and Ours scored a mere 6% rating. That means, of course, Cheaper by the Dozen 2 kids are worth a full .75% each, while Yours, Mine, and Ours children are only worth .33% each. Also, Cheaper by the Dozen 2 has grossed more than Yours, Mine, and Ours, providing a heartening example that, in these times of appealing to the lowest common denominator, the American public still has taste.
The real question is, of course, how does this augur for the movie industry? Are we going to see an escalating arms battle between multiple-child movies? Will next year's crop have 20, 22, or (God forbid) even 25 kids? Are we condemned to an upward spiral of too-many-children movies? Where will this insanity end?