Agressive roosters have ruined the whole chicken experience for a lot of kids. There is nothing funny about being attacked in the face as you have found out. Instead of your nose, it could be your child's eye. Personally, when asked I strongly recommend an all hen flock the first year. 
 
I have a theory, that a rooster raised with just flock mates, generally becomes a bully. He out grows the pullets, becomes sexually mature before the pullets, and because he is bigger and more aggressive, often times gets very mean. A rooster chick raised in a multi-generational flock, will grow up with quite a few birds bigger than he is, these birds will school him in proper chicken society, the older hens will not tolerate his aggressive mating stance. He must get much older, and more mature until he is granted that privilege. 
 
You have a beautiful set up. with plenty of room for your current flock. I would strongly recommend culling this rooster. As you and your son gain more experience, you can easily add a rooster, either raising him in your own flock, or getting an older rooster, that has been such a sweetheart, that his owner did not want to cull him, That is the one you want. Join a local poultry club, or 4-H, and you can find that rooster next year. 
 
Mrs K