No I don't think anything is strange, anymore. : )
More than likely when you aunt and two grandfather's died they came to you in your dreams to say "Good Bye". That is actually a pretty common thing. The soul comes and goes during death, which can last a few hours or a few days, in some cases a few weeks. I think of it as them preparing on the other side. Preparing to go
home. I could babble on all night about this.
Is your question how your aunt was able to save your life. Do you mean in which manner did she save your life or how could she save your life from the other side?