My wife left work because of a concussion and I left to be with her. I called first thing in morning on a Friday to ask if I could swap a vacation day I had scheduled for Sunday to be with her. I was told no, as it wasn't 24 hours notice, but I couldn't give 24 hour notice because we were at hospital the night before until 7 PM.
I feel it's wrong to be denied a vacation day so I didn't have to leave my wife alone with a concussion, especially after I had a doctor's note.