At your mother’s knee
Definition 1 of 1
Pro Tip 1/3Early Learning
Refers to knowledge or skills passed on when very young, indicating deeply ingrained learning. 
He learned the family business at his mother's knee.
Pro Tip 2/3Emotional Bond
Implies a nurturing relationship and a close emotional bond during learning. 
The ethics of hard work were taught at his mother's knee.
Pro Tip 3/3Idiomatic Usage
It's a figurative phrase not to be taken literally, but understood as learning from family from a young age. 
She learned her storytelling skills at her mother's knee.