I am not sure if there is heaven, or if there is, what it is like. We are grounded on this earth and can only look though the framework of our perception and limited understanding. At best it is a restricted view.
I do think that when we leave out earthly home, our spirit must persist in some form. To me, it is unfathomable that years of existence can so suddenly be extinguished.
My mother passed away yesterday after gracing this world, and my life, for 89 years.
And one thing I know, if there is a heaven, that is where she is now.