That is truly shocking, but seems to occur regularly from what i read on gn. I am so sorry. Our grown children seem to assume we continue to be responsible for funding their life styles and we are at fault because we have gone along with it. Now we are at fault for not continuing to do so.
Frugality, living within ones means, or just being careful is beyond some of these adult children and it seems too easy go withdraw contact as punishment.
Is there no one in the family who could act as mediator ? To answer your question i dont think any one knows how they would react in this or any other sort of situation.
We just have to do the best we can when we are faced with it. I think i would continue to send cards, but you must do what you feel is best for you and your husband. There is a site on gn which you may have seen which is for estrangement from children/ grandchildren. It may help..