"When I do see my little G/S's they chatter away to us none stop ! Myself and hubby are never doom and gloom, we always put on brave faces and perhaps that's the problem, we hide our health issues . The boys love seeing us and don't want to go home , they know they are loved, I tell them every time I see them". The answer has been given to you and you didn't realize it. Those little grandson's are worth every effort! It is a shame your son and daughter in law are so uncaring and your adult daughter as well. It is completely their fault and if you were to punish the grandkids for what the parents do to you, you would just be handing them yet another reason to shun you and perhaps convince the grandkids not to bother at all with you, or that you are a bad grandparent.
No, if the grandkids show you love, give it back. They will always remember going to grandma and grandpas house, the gifts, the love you show, perhaps a nice meal, some treats, etc. the whole wonderful experience. Don't let your selfish adult children ruin what you have in those grandkids. Enjoy and spoil them, they grow up so fast.