Congrats on resisting during your visit and continuing with your sobriety
I normally say that change should come from within ourselves, and that we shouldn't force other people to change for us... But in this case, I think it is okay, because it is tactful not to drink in front of guests who can't drink. Ask your husband to call and tell them you're trying to avoid alcohol, then bake them pie so they have good opinions about you and want to support you
I don't think they will have a problem keeping the wine in the cellar as a requisite for seeing their grandchildren
If it were a large family dinner on a holiday I would say otherwise (you have to be self-disciplined) but with just you, your husband and his parents, it's too intimate to ignore your feelings.