How to correct the idiom mistakes in this little joke?

One day, a classmate wrote a composition "My Home" in the classroom: "My parents and I live in my home. Every morning, the three of us do our jobs step by step and go home for reunion at night.

"Dad is an architect and goes to the construction site to direct and coordinate every day; My mother is a shop assistant. She takes pains to receive customers in the shop. I am a student, and I obey the rules in class. At home, we live in harmony and love each other. However, when I didn't do well in the exam, my father was ruthless and spanked me with a stick in his hand. My mother stood silent and never indulged. "