My only sibling died late last week. I was very close to him as we were very close in age. He was terminally ill and had been given 4 months to live but died after less than a month. It was unexpected. He was ND and unmarried with no children.
Anyway I have 4dc, one still at school and the others are adult. 2 of my adult dc telephoned me to make sure I was okay but the 3rd (married with dc) hasn't though she has phoned by parents to offer condolences. She sent me a short WhatsApp. I mentioned this to dh and he started laughing very loudly at my expectation as though I was putting myself at the same level as my parents in terms of loss. I am devastated at my brother's death. AIBU
[MNHQ have edited the OP so the thread doesn't get derailed by discussion about a particular phrase]