I agree, agnurse, but sadly you are missing a few points again, unfortunately. Where do I say or imply that AC or sons/daughters-in-law must do anything? Where do you see the language of coercion or compulsion in my posts? Sorry, but this just isn't rational. Could Chewbacca be correct? Are you also perhaps working in a field where you regularly come across grandparents who could reasonably be regarded as overly controlling/grossly inappropriate/abusive and are therefore, for several reasons, very prone to tarring all GPs with the same brush? If that is the case, I hope that you will seriously consider discussing these projecting and overgeneralising tendencies, blindspots and inappropriate use of this thread with your supervisor.
With a bumpy relationship between a GP and an AC or son/daughter-in-law in mind, I am favouring here such things as a two-way or reciprocal openness to listening to and learning from each other, admitting mistakes and the possibility of misunderstandings, using humour to defuse tension, recognising and moving away from rigid or black-and-white thinking, being reluctant to accuse the other person of being solely at fault, reluctance to jump to negative conclusions, cultivating patience, being willing to apologise, continuing to try to talk respectfully with each other, empathising with and validating each other where possible, connecting emotionally with each other, valuing each other and, as Joyfulnanna emphasises, remembering to keep the children's needs and wellbeing at the forefront of the bigger picture.
My guess is that most of the grans who read and post here would say that they tried to work at having pretty good relationships through various means but despite this they were cut off with little to no prior discussion or warning and little to no consideration of their perspectives and feelings, those of other family members and those of their GC.
Here ends my attemps to engage you in the conversation. I wish you well.