Ra's viewpoint was that the physical changes to earth during harvest are unimportant, and that every soul will be able to pretty much live out their life as they planned it (as long as their free will doesn't change the plan too much of course). The death of the physical body will come as it was pre-planned for each individual....the so called harvest is a metaphysical, after-death affair. I do not have the quotes to cite this, but I remember this much at least from reading the material. So given your example, the family of 4 who are each going to different realities will be none the wiser until they are on the other side, and at that time will remember everything about their identity and progress/return to whatever level of reality that is harmonious to them.
Godspeed!
Godspeed!