If he does, just go off sick Jim. Either back to back self isolations due to symptoms of every family member you have or play the stress/depression card.
The behaviour of many companies has been an absolute disgrace. Especially those close to / in London. The footage of the trains into London today was criminal.
My work mate forwarded a message from his wife to their family group chat earlier. She's Irish, head of the household, would have your bollocks in a vice grip if you crossed her. She's also a head nurse (Matron?) at a London Hospital. She's had to hand over 2 wards for Covid19 cases today. She's terrified and telling her 80 year old dad not to leave the house for any reason.