noun
disciple of one's disciple; grandstudent
Refers to a student of one's own student, often in traditional arts, crafts, or martial arts lineages.
師匠の孫弟子が初めて作品を発表した。
The master's grandstudent presented his work for the first time.
師匠 is the master or teacher; 孫弟子 is two generations removed from the master.
Compound of 孫 (grandchild) and 弟子 (disciple), literally 'grandchild disciple'.