Dear B
Disappointed but I guess not surprised.  He attempted to open their eyes but they chose to keep them shut – what an opportunity they had!   
In Gamanon I met a couple who couldn’t get their heads round that they were not helping their son and they were back for their 6th year even though they had been given all the knowledge over and over again.  I had no idea (or hope) that my CG would or could change at that time but I listened and opened my eyes so when he did talk I was able to understand so much more and most importantly to listen to what he said.  
You are a positive in your husband’s life – you are the one he can trust.   Parental feelings are not always unconditional love but …………….. maybe they need more time to think