How do you deal with a family member who chose not to tell you that a family member was dying, and having to find out from a coworker?

Basically the story is, my brother in law's mother in law is on hospice.. I had to find out from a coworker who is a friend of his. I'm somewhat upset about that. I won't say anything about it, I won't confront.. Especially when he is hurting. I'm just upset that I had to find out from someone other than family.. And I'm even more upset that my wife, his sister, wasn't told either.
How do you deal with a family member who chose not to tell you that a family member was dying, and having to find out from a coworker?
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