Wildmansmom - personally, I think AP isn't just about attachments to parents, it's about facilitating healthy attachments to other people as well, especially other people like grandparents. Nuclear families aren't particularly natural, our culture is about the only one that doesn't heavily involve grandparents, aunts, uncles, cousins, etc. in child-rearing. If your LO is familiar with your MIL and happy with her and she wants to have some special time with him, I say take her up on it.
This is so well said, and something that it helps me to hear, too. DD just spent the night with Nana and Grandpa last night for the third time, and she did great. It was good for DH and me to have some "us" time, and I think it really helps us be fresh and ready to shower DD with the love and attention I want to always give her. She loves them, too, and I think it can only be good for her to feel safe and loved with a broader circle. Anyway, what spughy said. ;-)
afm - I was wondering why my BH and period-like feelings and everything seemed to pretty much go away for the past week. Then it hit me: they pretty much stopped when I found out my grandfather was on comfort care. Now that his memorial service is over and I'm out on medical leave, I think I need to start thinking relaxing and welcoming thoughts for this little one. Plus, DH just finished his wardrobe (he built it from scratch) so I think we're both feeling like...ok, now he can come. Hear that, little one? Ready when you are!