FrodoVagins - No - my DD is not reacting to any favouritism on my behalf. I have told her that any of the children are welcome to come and stay with me overnight - individually or perhaps two/three at a time at the most. Only one DGD asks if she can come and stay so that is more regular. Apart from that I am usually asked to look after DGC at DD's house - which doesn't particularly suit me but is the way DD prefers. Up to now I've done as much as I can. The requests were not so frequent when I was married (divorced 4 years now) and then looked after my own DM until she died 2 years ago. Since I am now a "free agen"t the number of requests have increased steadily - along with the growth in my DD family and her work commitments.
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I think your DD will be phoning you before you have to phone her. Do not apologise, possibly tell her you don't mind helping but don't want to be tied down for a whole weekend every month. It was her choice to have so many children, not yours.