One parent has told me but not the other. They have separate wills.
The problem with that, though, is that everything you currently know could change depending on which of them dies first and what they've put in their individual wills.
Unless it's a basic mirror will that remains unchanged after the first of them dies, anything could happen.
I don't remember if my DPs ever actually talked about their wills, but everything that my DSis and I (their only DC) had assumed was exactly what happened - the first to die left everything to the second and then we received half each of what the second subsequently left.
I think it's good to talk about wills occasionally, to avoid any unpleasant surprises, but I think that some people talk too much about them, to the point where it gets uncomfortable. Some people just use it as another tool to control and manipulate their family, endlessly 'teasing' about what they will or won't put in their will and 'well, if that's how you feel, maybe I should think about changing my will' etc.
Maybe our DPs should have mentioned it clearly to us, but I can see why they wouldn't have felt the need to do so when it was absolutely 'textbook'. Not the same thing, I know, but maybe a similar principle to never feeling the need to sit your biological children down and tell them that they weren't adopted.