Are you close to replacing the factory tires yet? In a couple months a new set of all seasons might be in order anyway. A good all-season is fine in light snow. It's not a snow tire but for a short trip and being in FL the rest of their lives that might be a better option.
My wife drove on Falken 912's last winter and we had a decent bit of snow here. We are from Upstate NY so we know how to drive in snow anyway but those tires did fine and they are just a "performance" all-season. She does have a set of snow tires, as do I, but they are a completely different beast.
Truthfully all seasons are meh at best in snow but are definitely better than anything rated as a "summer" tire. True snow tires have a much different rubber compound that behaves very differently when the temps get below 40. The tread depth and design is very different as well but mostly its the rubber. It wears very fast too which is why you don't want to run them year round.