Another Pinner said: "This kept my 2 year busy for an entire hour and my 4 year old busy for 2 hours! YAY! Drop vinegar tinted with food coloring onto a pan filled with baking soda. Sheer minutes of colorful fizziness!!... Pretty sure we will be doing this soon!
Eventually they will get along. My mom would tell us to "kiss on the lips" if we weren't behaving. That was a great deterrent. I have my kids hug and hold it until they can get along. They end up laughing and rolling on the floor by the time it's over.