This is a terrible situation, and we all at one time or another find ourselves in it or watching it. I know the only comfort my maternal grandmother and my mother had in their losses were their deeply embedded beliefs in a Christian afterlife--although I never knew them to rationalize present suffering in terms of afterlife bliss. I know when I was a small girl, the only hope I had was an unconscious "knowledge" that I'd see my Grandma again (I say "unconscious" because our church services were all in German and if they talked about this, I wouldn't have known it ... besides, I was too busy mimicking the pastor's gracefully sweeping black silk embellished gestures to have noticed). Today, I do believe in an after-experience but don't define it in traditional Christian terms (which I think are metaphors for what was not known for a long stretch of human history) and certainly not in Christian fundamentalist terms (which is a historically new take on Christianity). As to "where" the afterlife might be, the answer to that begins with the understanding of a finite space and time.
Science has measured the shape of the universe (it is more flat than convex or concave); found the dominate sound of the Cosmic Microwave Background (CMB), which is the key of B (or is it B flat?); mapped out the clusters of dark matter; discovered that matter is moving apart but doing so in a distinguishable path moving toward one spot at one edge of the universe. This all supports the finding of a finite space-time continuum; and neutrinos are suspected of moving faster than the speed of light (!). Therefore the "location" of an after life must of necessity be beyond space and time as all that is within space-time is defined as finite and is dominated by baryronic matter (thanks either to the Higgs boson or possibly to those peculiar little oscillating neutrinos). As to the nature of the afterlife: it will be analogous to present life: likes will group with likes (despite overzealous Western misappropriation and misapplication of Yin/Yang opposite attractions). In other words, those with destructive, chaotic engeric dominance will group together as they do in life and those with up-building, nourishing energic dominance will group together as in life. May there be anything further in this description? Yes, there may be.
If the definition of "God" or the "Universal Consciousness" or the "Supreme Power" or "the heart-shaped vacuum" etc is accurately understood as being a personality that embraces/embodies goodness, peace, love, mercy, gentleness, kindness, longsuffering, righteousness, justice, sacrificiality, joyousness, lovingkindness, etc, then THAT energic dominance will group with or more accurately, perhaps, attract to itself the energic group that tends toward these qualities. Therefore, according to this description, it is possible to say that the energic dominance of "God" will attract to itself the similar energic group while the opposing energic group will be separated by virtue of its own oppositional energic dominance from the presence of the "God" energic dominance and the entrained energic group defined above as up-building and nourishing.
A couple of good books to read in this situation of loss and heartbreak and confusion are The Living Universe by Schwartz and Russek and The Reconnection by Eric Pearl [CAVEAT: The opening of Pearl's Part I biography strikes most people as vain and arrogant and "over the top": SKIP it. Start at Chapter 4 ... or even at Part II. Honest. I jest not. If you like Part II, you can work back through Part I ... starting at Chapter 4 ...!]