Thanks guys. It (the non-speaking) doesn't actually bother me as much as it does my sister (perhaps it's because I'm at work all day rather than my sister who is at home). I kinda feel sorry for him but also recognising that he's done this himself. Slowly but surely he's pushing his whole family away and if he keeps going, its going to be a very lonely life he'll lead.
Mum and I went and watched "Hope Springs" at the cinemas yesterday afternoon. Interesting movie, especially considering the position she's in.