Doctor Mom is self quarantining right now to remain safe. As a grandma and a doctor, she wants to stay healthy. But she's also currently on an emergency preparedness list due to being a retired medical professional. She wants to create a message chain. Leo says there's a thing called NIXLE that enables you to send group messages for emergencies. But she wants to do it in a manner that prevents group replies flooding people as well. Google Forms could be an excellent way to do it, but the responses have to be checked constantly.
From Scooter X in the chatroom - https://www.grouptexting.com/emergency-messaging. https://www.dialmycalls.com/emergency-notification/emergency-texting. https://simplifiedalerts.com/. https://www.capterra.com/emergency-notification-software/. Then there's Facebook Crisis Response.