Coping with dissidents.

Start measuring him for a cheap coffin. Ask him if he wants to make any changes to his will while he still can. Put some disinfectant into a spray bottle and follow him around with it.

Has he said why? Maybe he's scared so acting the ostrich. If he doesn't think about it then it won't happen.

Ask him what hymns he would like at his funeral. Take it very seriously and write down his replies. Ask him where he suggests having refreshments afterwards.

Show him videos of the 800+ coffins from those who died on one day alone in Italy

Isolate yourself from him. Sleep in a different room, eat away from him etc. Maybe he’ll take it on board then.