Who can I hold responsible for falling in a grave?

I recently fell in my step sons grave. I have not been able to go back to work in almost a month because I hurt my knee pretty badly. I went to the hospital for X-rays only to show it is not broken. I need an MRI to see if anything is torn. I cannot afford one and I'm in the process of looking for medical help. Not only was I injured, I was and am still mortified! The hole for the grave was not dug correctly for whatever reason and when I went to place a flower on the casket I fell in. I would like to know who I can hold responsible if anyone? Can you please help?