Listed here are videos that may be helpful for sharing with others to explain Selective Mutism
http://www.youtube.com/watch?v=NkXFULOtuns&sns=em A fabulous video on SM that shows two children, one who has overcome her difficulties. Also features Alison Wintgens (co-author of The Selective Mutism Resource Manual) discussing symptoms and phobias.
https://youtu.be/vWYtZ8AFz2M A take out from episode 1 of the My Child Won't Speak UK documentary. This episode features Maggie Johnson (co-author of The Selective Mutism Resource Manual) discussing the anxiety and lack of choice behind not speaking in conjunction with the rules a child creates with speaking habits and how scary talking can be for them. It also features the perspective of the grandparents of a child with SM and thus can be a great one to share with the family.
https://m.youtube.com/watch?v=tAkIXpykB5U This US video explains the perpetuating cycle of SM and some intial strategies for how to break this whilst beginnign a small steps programme.
http://www.youtube.com/watch?v=QOYwGjI4vVw&sns=em The first in a series of videos from the wesbite Confident Children. It features a discussion on 'what is selective mutism', discusses the fight or flight response and the need for reducing pressure to speak before working on a programme to address speaking anxiety.
You can also head over to the Facebook page Selective Mutism WA for more frequent updates on videos and resources.