Is this considered an employment?

I used to help my mother when she would go to outside markets. I would help her set up, help the customers, and sell the merchandise.

Recently, I m going to apply for a job (first one) and they ask about previous employment. Is my work with my mother considered a previous employment? I wasn t actually paid anything (never asked her to) but I worked like an employee. Or should I just list it separately, not under employment?