SmallestOne was an even number old on 11-11-11. Curiously, the base10 representation of 11-11-11 is one less than the the square of his age. SmallestOnes age is a singel digit, his brothes are double digits old. All three are now even numbers old, but the sum of the two digits of both older boys age is a prime number, the sum of these two primes is SmallestOnes age.
SamllestOne got to pay with his PlayDoh, but didn't get cake, we ended up taking him to hospital for suspected appendicitis. Turned out to be a false alarm, but little man had a birthday that was memorable for the wrong reasons.