My ex and I split two years ago; our DD spends her time with us 50/50. On the whole it hasn't been hostile. During the split we wrote up a Cafcass agreement which included (at ex-P's stipulation, though I agreed) that we'd wait 6 months to introduce DD to any new partners.
Very early after the split it became obvious ex-P had a new partner; DD came home talking about her (FWIW, not that I think it's relevant, ex and I are both women). ex-P posted the odd bit on social media, but never actually told me anything about her new partner, presumably because they were together long before the six months she'd suggested. Very occasionally her partner will sit waiting in the car when ex-P picks up DD; the first time I went and said 'hi' and she said 'hi' back, but my ex didn't introduce us.
I've not dated anyone serious since we split (and no one DD knows about); last year a (gay male) friend of mine and I tried IVF together and I told ex-P at the point when it looked as if it might work; the friend is someone she and DD have both known for several years, but at the point when it was possible he'd be more in DD's life, I thought it was the right thing to let her know. Unfortunately that IVF didn't work and I decided to go it alone. I'm now 15 weeks pregnant; DD knows. I don't want to announce it until later (anomaly scan), but I haven't said anything to DD about telling or not telling her mother (I couldn't keep it secret from DD until 20 weeks; it's obvious now if you're looking, and she is 8 and fairly aware of babies).
Which brings us to: I found out from DD, about six weeks ago, that her auntie is expecting a baby due end of January; yesterday I picked her up from ex-P's house and she was full of excitement that the baby had been born. I asked a couple of questions and it does sound as if ex-SIL and baby are basically ok, but it must have been scary as the baby will be, if I understand right, about 4-5 weeks premature.
DD is going down for a visit and I want to send a car and small gift for SIL and her new baby. I wasn't close with ex-SIL - not for any particular reason; just we didn't see all that much of each other. But DD will be delighted with a new cousin, and I think babies are something to celebrate.
I'd love some perspective here. My instinctive feeling is that, in an ideal world, ex-P would have given me a heads up both on her new partner, even if belatedly, so it would feel out in the open; in an ideal world, she might have tipped me off that DD was expecting a new cousin. Or am I expecting too much ongoing family chat? I don't know if it's unfair of me to have expected her to talk about her sister's pregnancy when I've not formally announced mine yet, too.
TIA.