Carpet Cleaner Company Gave My Family Co Poisoning

My daughter was staying at my parents and they had someone come clean the carpets. He had the van backed up to the garage with the doors open and the exhaust pumped into the house. My mom and daughter started feeling unwell, and went to the hospital. They both had carbon monoxide levels over 11 (organ damage occurs at 10), needed to be transported by ambulance to another hospital, and spent hours in hyperbaric chambers.

I am definitely going to ask them to pay for any medical expenses related to this. But my mom and daughter could have died if my mom didn't insist on going to the hospital and they stayed at home. I am considering taking them to court so this doesn't happen again to anyone else. Do we have a case?

They had a carbon monoxide detector going off, but in their confusion they thought it was the battery. This is in Utah.