Correct
膝下
/ xīxià /
Strokes
Definition
at the knee (in reference to children)/(salutation used in letters to parents or grandparents)
Example
As a Noun
early childhood ［a time when one is usu at one's parents'knees］
As a Preposition
［used in saying whether one has children or not］ at one's knees
As a Noun
［used in the salutations of letters to one's parents or grandparents as a sign of respect］
As a Noun
parents