Big Pappa Orson Welles played THE SHADOW on radio.
Correct, the Shadow as narrator had been played by several others before, but the Shadow as protagonist, actual character Lamont Cranston was first played by Welles.
I believe that the Lone Ranger and The Green Hornet are related, but I forget how exactly. I don't think it's that the Ranger is like Hornet's grandfather or great grandpa, I think it might be as a great uncle but again, not sure.
Correct.
Among the Rangers killed during the ambush at Bryant's Gap, is Lone Ranger's brother who leaves behind a wife and son.
This boy ( the Lone Rangers nephew) becomes somewhat of a sidekick to the Lone Ranger.
It is his son, who would eventually become the Green Hornet.
It was gray, but printing or coloring mistake made it purple.
And I think the character was named after Phantom of the Opera.
Somewhat correct. It was gray.
This was not a printing error, the first comics were all in Black & White, and within them Falk always refers to the costume as gray.
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Falk even considered naming the character The Gray Ghost.
The color purple , was added only when they expanded to the Sunday color strips. And the editors wanted him to have a color other than gray.
No errors, from then on he was purple.
At least in American comics.
Other nations who were circulating the dailies, sometimes chose their own colors to adapt the costume.
Hence in International Phantom prints, you often see Red, Blue, sometimes Green clad Phantom. everyone chose their own.