My Parents Put My Grandma In A Nursing Home And Tried To Hide It From Me

I am seeking legal advice for my grandmother who was put in a nursing home against her will by my mother. So for context, my mom is a chronic hoarder and basically hoarded her and my dads house to the point where when utilities needed maintenance or repair, they couldn’t get access. It started with my mom taking showers at my grandmas house. Eventually she moved in her spare bedroom. Over time my mom hoarded more and more of my grandmas home till it got so bad they could barely get along. It stressed my grandma to the point she had a breakdown and my mother called police. Next thing I know my grandma was diagnosed with dementia and was put in a nursing home and my mom and dad would say it’s no visitors. Eventually I had to call the police for a wellness check to find out where my grandma was staying so I could see her. I got in touch with an attorney to get her power of attorney changed to me so I could at least take her to lunch ect. We get the papers signed and notarized at the nursing home. We found that she was on private pay so insurance was not covering anything. After I asked if she had a form of ID on file and that’s when another higher up staff member explained that she was deemed mentally incompetent so therefore the papers she just signed were null invalid. I still have the paperwork just in case. What I plan to do now is call my dad to ask if he would tell the nursing home that’s it’s okay for me to take her on outings. If he doesn’t then it seems like my only option is to battle my parents in court for legal guardianship. I just want to be able to spend time with her outside of the home, take her to a movie just anything.