Every family has its stories. The family history which we have been told might be just the way it happened, and it might not.
Many things are recorded that did not happen. Our bloodlines run back through place and time, continous threads forming complex cultural patterns along the way, unraveling all the way back to earth. It might be the earth of this land mass or that. Or both.
In a sense it doesn't matter. As long as we remember that we all come from earth."