I'm going to ask about a will/anything I might be owed from my dad passing away
Do you not know if you are in the will?
I want to know who will inherit his stuff so I can sleep better.
Your sleep should not be dependent on whether or not you are in the will. It is wrong to just be worried about inheritance if your father is close to passing away.
I'm afraid he's going to pass away and I won't be able to inherit his car and my ex is going to take it.
Your priorities here are in the wrong place. Being in the will is secondary to the health of your father. You should care more about your father than the things in his will.