Without knowing more about you and your personal life, or being able to ask you more questions in person about this dream, it's difficult to interpret your dream objectively. It could be that this dream has some small prophetic value, though it sounds more likely that you sensing your own death in these dreams, is actually you sensing a part of your subconscious or conscious-self that is either dying off because you only needed it when your parents were together, or because you feel like your losing a part of yourself because of your parents separation.
The part of about them getting back together, is likely just your subconscious mind trying to workout an understanding of them being separated in your waking mind, or is your desire for them to get back together.
As for crying during the dream, or even waking up crying, that's not unusual, especially with dreams that take us to heavily emotional places.
Either way, the only person who can ultimately tell you what these dreams mean, is YOU. I find it sometimes helps to take the time to sit and meditate on your dream and really think about what you need to work out psychologically, and then if need be, just tell a few trusted friends or a counselor about the dreams, and see if your better able to understand them after that.
Hope this helps!