It's obvious that at some point, you're going to need to use the bathroom with your kids. Throughout each of the Disney parks, you will find bathrooms labeled "Companion Bathroom." These restrooms typically contain a changing station, a toilet, and a sink. (Some of the family bathrooms even have kid-sized toilets, as well as standard toilets.)
Family bathrooms are a great option for single moms traveling with sons, single dads traveling with daughters, and any single parent traveling with children of both genders. In addition, for any parent, using family bathrooms eliminates the risk of losing track of one another in larger public bathrooms that have many stalls.