Hey OP, I’m so sorry for your losses 💐 I thought I would jump on and comment as someone in your situation (albeit with infertility versus miscarriages- we have been trying for a year with no positive tests, recently received a diagnosis, and are probably looking to start IVF early next year). My husband’s brother and his wife have a child already and are now expecting their second.
I had been finding their family WhatsApp group really triggering anyway even prior to their pregnancy announcement, because of the plethora of lovely photos of their child enjoying all the types of things I dream of doing with our own child one day, and constantly worry I will never be able to. So I have already had the group muted/archived for some time, as other posters have suggested. Even with the group muted though, I found myself going back on there way more than I intended, because of a) Other logistical things, news about other relatives, funny memes etc. , all totally unrelated to them or their child, which I’d want to see- I’d enter the group to read that and then see a cute photo upthread which I wasn’t expecting, and it would be like a gut punch every time, and b) A kind of morbid curiosity about their lives and what they’re up to- this is hard to explain but I crave that life of having young kids so much, and feel it is so out of reach for me, that I then feel drawn to seeing what they’re doing as a kind of fantasy life shopping exercise. But, as you can imagine, this is definitely really bad for me and doesn’t help my state of mind.
In the end, I felt that the only sustainable option for me was to leave the group altogether, and I do think it was the right choice for me. As far as I know, everyone has been really understanding and supportive. I have also explained to BIL and SIL that we are truly happy for them and want to continue to support them and build memories with their children in real life- but that leaving the group is just something I have had to do mentally to try and survive what is becoming a horrific time for us. I do think there’s an important distinction here between social media, which can be a really painful day-to-day reminder for people going through infertility and/or baby loss, and carving out quality time to spend with friends & family with children…. which can be compartmentalised more easily and saved for times that you are feeling stronger. And it is definitely getting to see his auntie and uncle in real life (not through social media likes/comments !) which will mean most to your nephew, which I think would be your SIL and BIL’s real priority here 💕
I do see other posters’ points about whether you would want the family to be happy and excited for you when you do hopefully go on to have your own baby. However, my personal viewpoint on that is that I am so worried that we will never get to be parents, that quite frankly it wouldn’t matter to me whether other people were celebrating for us or not, I would just feel so incredibly lucky and relieved to be bringing a baby home at all!
You may agree with me on that last point, in which case I would honestly go ahead and leave the group if you feel it’s something which will bring you a bit more peace for now 💛 It doesn’t have to be forever (and I’m sure it won’t need to be!), and if you are still making the effort to be part of your nephew’s life in whatever way you can, I think your BIL and SIL will still see and appreciate that.
Ultimately, very few people who haven’t directly experienced infertility and/or baby loss really understand what utterly devastating experiences they are. Of course, there’s every chance things will be okay in the end, but until you know when/if they will be (which you don’t while you’re still in this waiting period), it leaves a hole in your heart that nothing can fill, which is just there constantly no matter what you do. Seeing other people have their own children, and move forward with their lives, is one of the hardest parts of it, because you feel so stuck in your own situation. So, from someone who does (somewhat!) get it- it’s absolutely okay to do what you need to do to survive this very difficult time, especially when it comes to something as inconsequential as social media/WhatsApp. It doesn’t make you a bad auntie or a bad person! I wish you all the best going forwards and really hope it will be your time soon ❤️