Theexwife
The granddaughter could have 4 grandparents as could the groom, which is an extra 8 people, and then you would get aunts and uncles who are close to their niece or nephew feeling put out that grandparents had been invited.
The line has to be drawn somewhere if they want a small wedding.
Indeed. And without knowing what relationship the OP and her OH the grandfather have, how often they see each other, etc, etc, etc, how can we possibly 'judge' the situation. Could be that one of the grand-parents is a problem and it was decided that it is easiest to have none. We just do not have any idea of what the situation actually is.
We are very close to our GCs, and they worship their Granddad and vice versa, so would be VERY hurt- but just depends, surely.