Holycow, This thread has gone OOT. From my DH being accused of being mad, and me being accused of being intrusive and sexist.
The fact is that DH is a doting and sentimental grandfather who assumed the family would be invited to our son's wedding. Son is 'the fun uncle' IFKWIM, the one always wrestling and playing with them while we are together, so we were suprised and sad to hear the 4 kids wouldn't be involved. No other children on DIL side, none of their friends have kids yet.
The other fact is that my son is a lovely young man with a beautiful loving fiance, and we are over the top to have her as part of our family. He has always been the most laid-back of my kids, and tends to do what makes others happy, including his bride. Yes of course it is his day as well, but brides do tend to have more interest in wedding details.
And we are not making any demands, we gave the money for the wedding as we did for our daughter 7 years ago. They can have a huge wedding, or elope, we don't really mind. The money is for them to have a lovely wedding of their choice. It would mean the world to us to have GC included, and we would offer more to have them, but not if it creates a conflict for them.
If it is only our family with no kids, then that is 6 people. GC would add 4. If it includes aunts and uncles, then it is 15 out of 50 total. We are not making any demands for friends or cousins, etc. The thing is, right now, we don't know who is on the list. I don't think it is unreasonable to ask. I've already warned my sisters that they may not be invited, but DH's sister is already asking what hotel to book, and what is the date.
We do plan on having a word with our son. I won't be commenting further on this thread. Thank you all for contributing.