family drama help!

Hi! My husband and I got married a few months ago and decided to try for a family. With infertility problems on both sides we thought that if we ran into a problem we would have more time to do treatments and etc. imagine our surprise when we get a bfp one month after trying.  His brother and sister in law have been trying for 8 years but don't really talk about it or give us updates on how they are doing. It's like babies are a forbidden subject on his side of the family. It was hard but we called each family member to tell them the news. Ever since we've told them they've acted weird. They want to hang out all the time but never bring up the baby. We of course don't bring it up to them because we feel guilty. I also have a sister that her and her husband have been trying for 4 years and have gone through 4 rounds of <a href="https://glowing.com/glow-fertility-program">iui</a> and are looking into <a href="https://glowing.com/glow-fertility-program">ivf</a>. When I told her she started crying and we didn't talk for a while. Now we are talking again she ignores the baby to. I understand where they are coming from with being upset. But is it normal for them to ignore the issue completely. I want my baby to have loving aunts and uncles but feel like they won't want to be around the baby when it is born. I don't know how to go about the situation. Should we just continue to not talk about it or bring it up. Has anyone experienced this before and has advice for me?