My little brother has fallen 2 weeks ago, i think he fell on right side. now he don't walk normally, i think he getting better. something should i do?

Hard to say : There are many potential causes, some will get better do others not. For example, a sprained ankle can usually do fine without any treatment. A broken bone might strt feeling better, but might be healing in a bad position and might cause problems. He might want to be checked if he is still having significant problems. Thank you for your question.