My friend’s younger brother passed away about 2 years ago. Adult, but still relatively young. Anyway, what struck me was that his family basically had a plan for who contacts who. Probably pretty useful in case of a medical emergency as well “Brian is in the hospital and might not make it” scenario. So the parents and kids called a couple people in the family and basically directed those people to let further flung relatives know, so they could use the time to concentrate on more immediate things.