MiddleOne is now a prime number old. His age added to that of EldestOne (also a prime number old) is a two digit even number. Adding the first and second digits gives SmallestOnes current age. Dividing the sum of EldestOnes and MiddleOnes age by SmallestOnes age gives the last digit of the sum itself.
Building fanatic MiddleOne has conceived a great desire to build AIrfix models, after seeing James May's "Toys", where he built a 1:1 scale model of a spitfire (yes 1:1 you read that right). So apparently has everyone else and the model shop (which I had to drag myself away from) was sold out of everyting Spitfire related. But he got this great Eurofighter.
The big issue is how to stop him hogging all the models so that I can have a go.