Sadly we can only 'advocate' for children so much because ultimately these are not our children and as much as it tugs at the soul to see them struggling when there is such EASY fixes with or without the 'label' of whatever disease or condition they might fall under .... so while I do advocate to clients to seek second opinions around what I see in program that might be red flags for something ultimately if I see a child struggling I put the tools in place to help them regardless ... so IMO if you think your nephew might have Autism I would just TRY some of the tips and tools that work with children with those tendencies and see if they help him while in your program .... there are MANY things I do regularly in my program that are designed for children with 'high spirited personalities' or 'ADHD' even when I do not have any children with those 'tendencies' because well IMO they are practices that work for ALL kids to stay calm and feel like they have some control over their world.