Am probably being unreasonable as feeling fraught after a family holiday with the in- laws. In-laws (grandparents to my dc) were very keen to spend time with the dc so we rented a cottage together. Their spending time with DC (aged 4 & 5) involved them looking at the children and doing nothing to help entertain them. DCs requests for a drink or the loo went "unheard" until either DH or I were back in the vicinity.
Obviously they're not their DCs and the responsibility for them is mine and DHs but isn't part of spending time with the children dealing with the boring stuff too? Everyone is fit & in good health. Perhaps cherry- picking the good bits is a grand-parents ' prerogative. Keen to hear of your experiences.