My Dad has dementia and was neglected by my stepmom and now lives with us. We filed for divorce, but can I sue her civily after it's final?

My step sister called me to tell me that she thought her mom was trying to kill my dad. My relationship with my stepmom became non existant once my dad was diagnosed with dementia and talking to my dad, he stated that he was fine. I immediately went to his home in Tennessee and brought him with me. I took him to a doctor and he was 25 lbs underweight, he had and I am still fighting sores on his arms, although they are almost gone now. He was taking expired Aracept for the dementia that the doctor had originally given him the previous year when he was diagnosed. He was continuing to drive even though he had turned onto the expressway twice the wrong way and he has macular degeneration in both eyes and is almost completely blind in his left eye and has 80/20 vision in the right. She punched him at least three times that I am aware of. She would leave him outside in the heat without fluids while he worked in the yard. I could go on and on with the verbal abuse he endured. When we filed for divorce in Tennessee, we filed under the grounds of "Improper Marital Conduct" #11 - Cruel and inhuman treatment. Can we or I sue her after the divorce is final civilly?