Brad Said:

I disagree entirely. In English, Master and Grand Master does imply great knowledge and ability. A master painter or a grandmaster of chess are examples of how the term is more commonly used by English speakers.
I have to agree with ctoepker on this one. Especially since we are not speaking of the english use of the word Grand or Great Grand.

Gung fu (traditionally) is based on a family structure. There for my Sifu= Teacher Father and his teacher my sigung= Teacher Grandfather and his teacher Tai Sigung= Teacher Great Grandfather.

I do agree with you that in english the word great or grand can be in many cases and will imply knowledge or skill level. However, we are not speaking of english titles but Jun Gok Mo Sut family structure.

Peace

Jerry Battle