What does "at his mother's knee" mean?

[Jojo]

English Language Tests, Intermediate level

ESL/EFL Test #103 "Charlie's Knees", question 3

He'd learnt to think he was important from an early age ......... his mother's knee.

(a) from
(b) to
(c) over
(d) at

English Language Tests, Intermediate level

ESL/EFL Test #103 "Charlie's Knees", answer 3

He'd learnt to think he was important from an early age at his mother's knee.

Correct answer: (d) at

Your answer was: incorrect
He'd learnt to think he was important from an early age from his mother's knee.
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What does this expression mean? at his grandmother`s knees.

Jojo

[Alan]

Hi,

This means that he had learnt this from a very early age since when he was very young and sat on his mother's knee.

Alan
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English as a Second Language
You can read my ESL story Don't bank on it