For some reason, SIL and FIL have decided FB status updates are how they should inform other family about big news. It's how we found out FIL had cancer, when FIL was hospitalized months later (for an unrelated reason), when SIL got pregnant, when SIL got married (we didn't even find out until a month later), and now that SIL has just had her baby. We never get a phone call, email, or even a text message. DH usually calls them after he sees the news on FB, usually saying something like "So, I see you mentioned [important news] on FB...what's going on with that?"
Since the most recent news announcement, I've pretty much decided that if we aren't worth a phone call or anything for important news in the family, they shouldn't expect us to care. Not a direct cut, but more more of a mutual indifference. Is this petty?
If another family member asks us why we have not reacted to the news in some way (like sending a card, buying a gift, etc.) what should we say?