Hi, my 4yr old little boy is just starting to notice things ate different with his older sibling. She is 6yrs old and has level 2 autism. She talks but at a stage a 3yr old would. Sometimes she plays other times she likes her own space and likes to play on her own. She doesn't like loud noises and can't follow or understand games. Her brother is very understanding and tells everyone not to make loud noises around her, he always helps her and looks after her and is very protective.i have tried to explain autism to him but I'm not sure how much he understands. When he wants to play with his sister sometimes she runs away from him, I have noticed a few times it's starting to upset him....I tried to explain that sometimes she needs her own space and how much she loves him and when she doesn't understand something she runs away from everyone not just him. Any tips on any other things I could do or say to help him understand.