Can my stepbrother remove anything from my stepdads and my mothers home like a car?? My stepdad is not supposed to drive but nothing should leave the estate?? Besides the car is still insured by my stepdad? I am POA for my mother but stepbrother is not POA for his Dad?
Are you sure you want to do this? What are the other options for looking after him?
How is the nursing home being paid? From mom's funds? Medicaid?
Wouldn't it be best, if you can, to get together with your stepbrother and any other siblings and thrash out what the care plan is? The photo-taking sounds like the distrust could be mutual, and if there's no need for it on either side then the sooner you can sweep it away the better.
Are you living in your mother and step-father's home, or what's the arrangement that means you should get compensation for looking after him?
As a starting point, though, if your stepbrother has taken something that belongs solely to your stepfather, then it isn't that it doesn't matter, and you should keep track of what's going where, but I wouldn't make it my problem if I were you. It's between him and his Dad.
Whose name is the house in? Is his father still competent to express his wishes? Does he with this son to be his POA, meaning that he is empowered to carry out his father's wishes?
Is your mother still using the car?