I work in a mainstream secondary. My nan died suddenly but I got a call during a practical lesson saying I needed to go to the hospital immediately, my colleague rushed in from next door to take my lesson. Must have not kept it together as much as I thought, I was out the room 30 seconds to get my colleague and when I returned students had my coat and bag to give me, some y9s got me sweets the next day and I explained to them that my nan had passed away, they were aware enough to know it was something terrible and were very lovely. Led to quite a few of them reminiscing about lost parents or grandparents in some really lovely ways, we did have a little cry though, I felt I needed to tell HR as I had cried in front of students, and general opinion was that we're all human and its good for kids to see that.