Sometimes communication fails, as I’m sure it does in any family. Mom thinks Dad told you Dad thinks Mom told you, siblings think parents told you etc etc etc. Unfortunately when I got missed out on the family news tree, it was something that was a bit of a big deal!
Now, she was very old when she died, and I wasn’t close to her, I personally hadn’t seen her in quite a few years. But she was family! We had to laugh about it, and we still laugh about it now! No one knows how I didn’t get told! Oops!