Oh dear "Granny wars" eh? I agree you mustn't let yourself be dragged into these - that way madness, or at least sadness, lies.
Recently when DD and SGC were down, DD made some comment about how the other granny has much more "equipment" for the boys,in this case beakers, and I just felt the tears well up and said "Please don't start Granny wars that is just unfair" and she realised that what she had meant in jest, had actually been hurtful, so I can admit to over-sensitivity in the Granny-comparison area! I know that the other Grandparents are much more able to look after both babies as her DH is fit and well and very good with tinies, whereas DH is, as you know, in poor health and I suppose I am sensitive in that respect.Maybe the other Granny is aware of her own insecurities and it's actually not really to do with the DGC?