We miss things all the time: Flights, meetings, tests, etc.
We have normalized missing to then try to explain after the fact. Thats not how it works for the courts. You must show up unless you are physically unable to do so. Yhis is why the burial date mattered.
Clearly a death on the same day would make it impossible to attend. But a few days prior would mean its not impossible. You simply need to notify and a new date is granted. Its just poor planning on the plaintiff side.
His grandfather did pass away a few days prior.
Depending upon what was happening with the related family, there can be a whole bunch of things that need urgently taking care of in relation to it.
"The respondent also admitted that his grandfather died on April 9, 2019, and was buried that same day."