Noun
near one's knee
彼はまもなく親の膝元を離れる。He leaves the parental roof soon. (by) one's side; (at) one's hand
place under the protection (of one's parents, etc.); (under) the care (of)
territory of a powerful person
see お膝元
address used after the names of one's parents, grandparents, etc. in a letter
Also written 膝下【ひざもと】、ひざ元【ひざもと】、膝許【ひざもと】