The more unrealistic it all becomes.
All of Q's word's are chosen very carefully. Realistic implies a view in which the physical, material world's mechanisms reign supreme. Thus - the farther it all goes, the less it is all concerned with "real."
"The Hidden Hand" interview is a bit of a poisoned well, but if you take it as such, then it outlines what we are talking about.
The blood lines aren't just "families" - they are taken to be the incarnate will of the fallen angels of the Sephirot - or perhaps its inverse. Perhaps the trees are the same and the war is over how the fruit blooms.
In any case, as these angels fell, they were breaking themselves up from the greater being into the smaller beings - eventually becoming blood line families who teach that they are part of a sort of Luciferian hivemind.
It's easy to see how they could consider this story evidenced within the context of an extra-terrestrial plot of intervention on our planet… And who is to say it isn't the truth, despite it being unrealistic?