Quick question: Have you talked to him on the laws of youtube copyright yet?
Also, people can't just walk around Collins videos when they are fake. You are publishing content without the sound artist's knowing, let alone permission.
every single video is fake
Why don't you not post it then? Make it into a home video or something, we can't just go around your videos knowing it's fake, no one really can. You are publishing someone else's content without their permission.
You could go a step further. Ask the artist whether they'll be able to rent out the rights to you, therefore no copyright!
However I urge you to read the first post of this thread. It will give you all the description you need as to why we have flagged up your son's videos.