Each kid has done it, confusing the parents names, even though they did just fine for weeks ahead of time, their mouths go faster than their brains. With the first 2, it happened over weekends. Daddy would be mommy, and then some combo of names until about Sunday afternoon and then he’d be daddy again, only to become something else by mid-week.
Casey spent the whole of winter break getting it right and the last few days calling us mah-ddy (talking to me) and damn-ey (talking to my husband). Priceless.