My brother was just diagnosed with a brain malformation

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My brother has Arnold Kiari a brain malformation where his brain grows onto the back of his spine. We live right next to a skatepark and we both skate everyday but now since he found he has this the doctors will not let him skateboard for the rest of his life. My brother is only 11 years old and he's had it all his life but just found out about and my parents will let him skate but they don't want him to do things to endanger him and he tells me he still wants to skate and play a little bit of sports but I don't want to tell him he can't, he takes it easier with things but I always have the fear of him falling and gettin his brain chopped off right in front of me how do you think I should react to him doing things that can endanger him?