Superman has died multiple times in the comics. However, it's not as simple as giving an exact figure. Different comic arcs and universes handle his death differently, making it a bit convoluted to determine an exact count.
It could be that the situation around his death had some ironic elements. Like he was always so careful about one thing, say not getting wet in the rain, but on his last day, he ended up in a big puddle and it just makes for a strange and funny story to tell later. It's not making light of his death, but finding the odd and humorous moments in the events leading up to it.
In this kind of situation, a major challenge is emotional. The mom has to sort out her own feelings towards her late husband while also trying to develop new feelings for someone else. There could be a lack of support from the community, especially if it's a small - minded one. Plus, she may be worried about introducing a new person into her family's life. What if the new partner doesn't get along with her kids? It's a complex web of emotions and practicalities.
Yes, there could be such a story. Maybe the dad, as a taxi driver, did something heroic like saving someone in a dangerous situation but unfortunately lost his life. It would be a very touching and inspiring story for the student.