23. My brothers were switched. One always weighed 6 ounces less than the other. My parents used to paint their toenails different colors. After a bath one day the nail polish came off. My dad guessed who was who and painted their nails again. At the next doctors appointment the wrong twin was 6 ounces less. We just kept it that way.
24. Not a parent but I have identical twin younger brothers and we usually tell them apart by the fact that one usually wears red and the other usually wears blue.