These terms Grand Master and Great Grand master are actually relatively new and weren't used before the last 15 years or so.
I think they are terms that are brought into being to comply with teh western mentality in regards to heirarchical structure in an organization and this need to know where one "fits in".
A phenomenon that is slowly leaking back into the east where it didn't exist before.
My personal opinion is that these terms and references are only serving individual egos and are poisoning the truths of martial arts and their practitioners.
Self titled Masters and Grand Masters are only that "self titled".
They may be good, but the premise is pure bunk.
A sifu is a different thing and people are even co-opting that title as they ae the title si gung and dai si gung. They are terms related to a familial structure that was and is part of the norm in instruction in Kungfu.
In the past, and in some cases still, a student would enrol in a gwoon and live in it. The student would learn in all aspects of life, morals , ethics, regular school, life skills the works and the Master of teh school was named "sifu" which means Teacher/Father.
This term was in recognition of the students and charges chief benefactor being the benevolent one who gave them instruction in how to be a good citizen and a contributor to not only society but to humanity in general.
The extraction of all the rest and the keeping of only the martial arts is something that has occured and people chose to keep some of these structures without the whole schema being applied.
This has led to theh modern issue of those who aren't, calling themselves these titles when in fact they are nothing close to the original intent of the structure.
the western paradigm is not all poison, but it is surprisingly egoi based and driven by the want for individualistic power.
In truth, a true Master would never call himself this and would indeed not let you kneel before them or serve them anymopre than they served you. While at the same time they would make the true and genuine effort to ensure that you had the opportunity to see the thruth they know and to have the opportunity to attain kungfu by learning from doing and by enacting thsoe experiential activities that will bring this objective to fruition inside of you the student.
It is a conundrum for many teachers of martial arts these days especially in the west here by my perspective which is a western one.
Understand that this is my observation and opinion, but I don't think I am alone on this view I hold.
- Don't bother demanding respect. You'll get less. Earn respect through what you do, you get more.