Thank for all your replies. It’s early days yet, and sister has only just found out about the baby. A couple of weeks ago, she was telling me about their plans for exotic holidays once she and her DH retire, but now she has decided to retire early to look after her GC. I should mention that she hasn’t actually been asked to do it and doesn’t know what her DS and DiL’s plans are, but, in her opinion, a nursery will not be able to give the child enough individual attention. Sis is very involved in her children’s day-to-day lives and can’t believe that I am happy being a long-distance GP (although I am lucky enough to see my GC several times a year) and she has told me in the past that she would want to be a big influence in her grandchildren’s lives. She is quite bossy, and does tend to think she knows what is best for everyone, but she has a good relationship with her children and their spouses, who are all fairly laid back, and I think that if she offers the childcare, her offer will be accepted. However, my MiL was a very similar character to my sister and, before we had children, I just found her interference a bit irritating, but once DS1 was born, I was like a lioness defending her cub and our relationship never really recovered! I’m probably just projecting my own past MiL issues on to this situation, but sis does seem to think it is up to her to take charge and organise everyone as usual.
I am also worried about what she is taking on. My friend has looked after two of her GC and the second will start school next year. Friend arrived at my house a couple of weeks ago, clearly at the end of her tether. I made her a cup of tea, told her to put her feet up and took her GD out to the park for an hour. When I got back, she told me she is absolutely exhausted. Her DH helped quite a bit with the first GC, but seems to have had enough of it now and care of GC2 is falling mainly to her and, now her other daughter is pregnant, she sees no end to it. However, friend is my age (early 70s) and my sister is much younger, so will probably cope much better with full-time child care.
It’s my sister’s business and I would never try to interfere, but, I am hoping that when she is here, I can just tactfully get her to think it through a bit more carefully before she jumps in with both feet! She is a lovely lady, who adores her children and always has their best interests at heart, but I can’t help feeling it might be time for her to step back a bit now.