As I've said many times, most people know that these movies often have little acquaintance with realism, but I still have to say this. The confrontation between mom and the institution is ridiculous. Any institution experienced with dealing with autism would have gone way overboard in informing and preparing the entire family before they ever got there. Much of the early conflict would NEVER have been allowed to happen. Routine is vital for families with autism. Changes in that routine would take place with great care and preparation. Their rules make total sense, but they would never spring them without meticulous preparation. I found these issues in the movie to be greatly distracting sapping potential enjoyment until the story got past those issues. It does eventually fade away.
Much of the focus of the movie is on the family. Mom and Dad dealing with their past issues. Sister struggling with being the "other" sibling. The house for family members is run by another mom with a child who seems a little more functional.
I never really fully got into the rest of the move, so I can't say more.