There is no valid reason for this other than BIL leaves alone in a flat without a garden and is bored on his own. He is working from home.
MIL has Addison’s disease which has a direct impact on her immune system and FIL has numerous ailments including being diabetic. If either of them get ill there is a big chance that they will be very ill and I would really worry about MIL’d chances given that she is floored for weeks with a stomach upset.
BIL insists he’s okay to go home as he has been self-isolating for 2 weeks and he is fine. He hasn’t been self-isolating, he has been shopping in supermarkets in that time. DH and his 2 other brothers have strongly advised him against it but he’s insistent. I am so fucking angry at the pure selfishness. He doesn’t think it’s a big deal though. 😤😤