16 yr old Aspie son and our family dynamics

Hi. I'm new here. My son, Ryan, was diagnosed with Asperger's last year. It was a relief for us both to finally start understanding him better.  My husband, his step father, just does not get it and, frustratingly, thinks Ryan should be able to behave and think like a NT boy. To this end, we are gradually losing the family connection and I feel like I'm stuck in the middle trying to get them both together. Do any of you have advice on how you managed to get your husband to understand without sounding patronising or blaming?