Hey Sedim,
I felt like I didn’t know enough about the Tree of Life to give you a proper answer…
That’s weird that for such a thorough article that they don’t include the royal cards!
Rebecca has gone over all of them in-depth on the main site and I talked to Lady Gene about them a bit in the July Tarot topic as well:
There’s a lot that can be said about the royal cards… I don’t have time to write it all here.
Each suit is it’s own family, in my understanding. Each page is a youth still learning the arts of their family. Each Knight is the young adult now learning how to carry those principles into action. Each Queen is how that fully matured art manifests in the feminine archetype. Each King the same for how it manifests in the masculine.
I don’t know if that helps. 