I've got two photos that I use depending on the circumstance. Both were almost accidents, but since they have a high "spousal approval factor" have remained in the rotation.

FYI - my kids learned to not waste time by protesting at a very early age. Not sure why yours are a step behind - perhaps they are as stubborn as your wife? Can't wait to read your writing when they are teenagers - I imagine the battles with your wife will be epic :)