OP, I think your offer was more than generous and your son and his future bride should be ashamed of themselves.

When my son got married, the bride's parents paid for the wedding, her gown, flowers, reception. This was something they wanted to pay for. We paid for the rehersal dinner (which was about $1,500). We offered to pay for the photographer but the bride's parents insisted on paying for it.

However, the bride's parents did absolutely nothing to help in preparation for the wedding. I was basically the bride's mom and the groom's mom. I did everything the bride's mom was supposed to do. The bride's parents showed up for the rehersal and wedding and knew nothing of what was going on.

I've never heard of the groom's parents paying for the honeymoon. I think once the bride and groom are married, that's their responsibility.

Good luck, OP, because I think you're going to need it if this is the way your son and future wife are acting now.