The books mentioned were PRINCE COMMANDS, RALESTONE LUCK, and THE SWORD SERIES.

Expecting 'The Lady' to write a sequil to any of the books printed in the 1930's or 1940-50's. Well It isn't very likely. I guess everyone changes in 45 years, and revisiting old characters isn't likely.

What I do know about Andre Norton is when someone has asked her "What ever happened next to" any character, she has replied; "I don't know either. Why don't you write it, and then we'll both know."

As for Raleston Luck: Well I'm always reminded of the Norman Rockwell painting of a family tree. Two branches of a family. One branch had Pirates, and the other branch Puritans: meeting several generations later in one of those cute red head kids. But the book was originally written when Andre Norton was in HIGH SCHOOL! I doubt that I could write anything about the 1920's with the correct feel and accuracy. I think that the whole history of that era underlies the text.

I think that in any case, you'd be more likely to get a generational sequel. What happened to the next generation. Something similar to YANKEE PRIVATEER and STAND AND DELIVER for the Star family; or STORM OVER WARLOCK & ORDEAL IN OTHERWHERE and FORERUNNER FORAY for the Lantee family.

The two series that are being continued: Solar Queen and the Time War (Ross Murdock, Travis Fox, and Gordon Ashe) were started at/by TOR. Even these are being re-considered and delayed.

With the publishing industry it is pretty hard to determine what will be published. A sequel to MARK OF THE CAT never got off the ground, because "the publishers didn't want it." Then again there are billions of Zanth books, and R.L.Stein, and who knows what else series because publisher's think that these will sell.

Here's a place to look for Andre's Comments on this topic:
“Series and Sequels, The Problem Thereof.” Andre Norton: Fables & Futures. Ed. Anne Braude. Center Harbor, NH: Niekas Pubs [paper], 1989.