I'm not a grandparent, I am a DIL. I have read through this whole thread and a couple of comments struck me:
'Can't help but think that the bthe parents/ mums of the dils could be less selfish and make room for their sils to share and allow bonding of his offspring with his parents too. it's the gc who lose out in the longer run after all'
And:
'Thanks but may be it's time for DILs' own mothers to be less selfish hogging grandchildren and, in effect, their SILs? a bit of consideration on their part would reduce so much anxiety/ tension/resentment/misunderstanding'
What if it's the case that the DIL's parents don't 'hog' their grandchildren and in fact it would be nice if the PIL wanted to hog them a little bit more than they do instead of playing favourites with other GC? This has caused me great anxiety and certainly I feel that my dcs lose out because of their behaviour. In fact I have gone almost a whole year without seeing PIL because of the situation. My DH takes them to see them occasionally but otherwise they are simply not interested. I'm sure that I, as the DIL am being painted in much the same way as some people have mentioned up thread. However, I feel as though I have had to make this stand for my DC's sake and to try and make PIL see how their behaviour is unfair.
I had a good relationship with them before SIL and I had children. Then the gulf between the treatment of either set of GC became very apparent. I am totally aware of the mother/daughter thing, but this shouldn't necesarily come into it where the GC re concerned
FWIW, my DH doesn't agree with me-he was brought up without a backbone and I'm still trying to talk him into getting one for himself! It always hurts when he is happy to keep PIL sweet by not fully confronting them about it, but will see me upset over this whole issue!