My mom was misdiagnosed and passed away. I want to know if I can file a lawsuit.

She was told her gall bladder needed to be removed, and that she had "several" mini heart attacks. A few months ago they scheduled the gall bladder surgery only to find the gall bladder was completely healthy. A week later when she ended up in the ER for the same back and chest pain she had complained about for over a year, she was diagnosed with stage 4 liver cancer. Because it had spread throughout her stomach and her back, causing 2 of her vertebrae to collapse. Not only that, but what they thought were heart attacks turned out to be bloodclots; one on her lungs and one underneath her breast. My mother died on July 28th. My brother and I would like to know if we have grounds for a lawsuit?