Certain kinds of classical music can often help to quickly quiet hyper children. One popular piece is Pachelbel's Canon in D. Another is
J.S. Bach's Air from the Overture #3 in D major.
There are a number of other things that you can do that are effective in calming hyper children.
These include deep breathing games and humming games.
These games are also very useful in training vocal skills for any age and are easy and fun to do.
I'm including a link page to an article for you to read, in case you want to try them. They work well!
For the "r" letter, it's hard by computer to describe how to do an exercise because I'd have to hear him and watch his tongue and lips, but perhaps I can try. First I'll need you to write out the type of sound he now makes instead of a clear "r." And what is the speech person at public school doing for that particular letter?
About Alaska. Yes, it's a wonderful place to visit. I've starting writing a book about it and have posted one page about it on my website.