Hi everyone. I'm trying to help out some older relatives with leaks and other issues in the home. I fixed some cartridge faucets but in another bathroom pretty much all the fixtures of a tub are leaking (apparently it hasn't been used due to the leaks for some time). It also has different types of faucet handles than the ones I was able to easily fix. I'm going to attach a photo of the above and below. It seems like the very top (with the stem) doesn't want to turn independently of the rest of the fixture. I'm not sure if that means I have to take the hardware under it apart to get to washers, etc. As you could guess, I'm new at all this but hoping to get a grasp on it so we don't have to try and call for simple repairs. Thanks!