extended family dinners continue despite government measures

Hi everyone, I am in a fix and hoping to seek your opinions. I live with my in-laws and my MIL's family has a practice of going to each other's home for dinner on a specific schedule. I understand that under the new circuit-breaker measures, we are not to visit extended families nor are they to come to our home. However, my MIL still openly invites her family to come over and they always gladly show up. My husband has tried speaking to her to stop, but she stubbornly continues. Should I do anything? Can I do anything at all? I have a 10 m.o. and I am dead worried about his health and safety...