Women usually take care of the sales, accounting part.
Not only Chinese people work together with family members, they also work together with their community members.
People from the same community establish their business next to each other. They work together with customers, suppliers from the same community. The best example of this all over the world is the Wenzhou Chinese people.
Working with your family members has many implications:
Chinese people live at their working place with their parents, grand parents, children... There is no distinction between private life and working life. Therefore people are available everyday for work!
There is often less pressure at work, since you work together with family members. There is a stronger mutual assistance.
This family and community business organization favours briberies, favoritism toward members of the same community. It shuts down whole part of the Chinese society. If you don't belong to the community, you can not access some jobs, service, product market.
There are also some implication regarding the division of work between men and women.