She needs to continue to pursue this. Those are some fairly classic symptoms. Does he have one area that he really really concentrates on. I would love to give you an example, but I don't know how old he is. For a teenager...it could be he only talks about something such as Anime...that's all he is interested in etc. If he is in school, you might look in to the possibility of working with the school to have him tested. They are generally poops about that so you have to be a bit pushy. In the meantime, there are many many websites that give info. on aspergers and autism and support groups as well. You might tell you sister about this: http://www.udel.edu/bkirby/asperger/ which is a website called OASIS: Online Asbergers Syndrome Information and Support. God bless!