first I focused on the CHI RHO which led me to the Labarum which led me to IN HOC SIGNO VINCES which led me to
https://en.wikipedia.org/wiki/Sacred_Military_Constantinian_Order_of_Saint_George
which led me to the Houses of Bourbon - Two Sicilies and the House of Bourbon - Parma, both of which display the Che Rho on their standards.
The Sacred Military Constantinian Order of Saint George has the same standing as the Knights of Malta. A sovereign Religious-Military order although as we know, The Pope took charge of the Knights of Malta in 2017.
Could P = Papal Royal Families?
I have dug for 4 days and listened to all of the "alternative" theories AGAIN and they suck AGAIN.
I started over and the Chi Rho kept coming back again and again.
Working on a chart.
One thought that occurred was that maybe they believe that they are the actual descendants of Jesus? I have heard that story being told about various royals and the connection to the Greek name "Christos" got me thinking.
Ok back to ultra lurk mode.