"I think children are generally:"
1. A joy to be around.
2. Able to keep you on your toes, but are so rewarding to work with.
3. Among the most lovable people in the world.
4. A gigantic pain in the ***.
If you use number 4, you probably won't get the job. The first three are more accurate, in my opinion. Good luck and I hope you get the job!
By the way, I think you meant 10 points - it's not possible to give 20 points on here.