That is just awful to read.
Yes. It is. It is sad and yet so bizarre.
I have ridden on tanks in the Marine Corps and this is precisely why it is frowned upon not to mention that tanks are big targets and being close to them in certain instances is dangerous. The visibility for the driver is poor and they tend to run over things. The concussion from the muzzle blast when one is close is stunning as well.
Terrible event, especially at a family gathering.