If China people find jobs in large Australian companies, can they apply for employer-sponsored immigration?

You can apply for Australian employer-sponsored immigration if you meet the following conditions: under 50 years old; College degree or above; 6 points for each IELTS (some IELTS can be exempted from the exam); Engaged in professional work for more than 3 years.

Can family members apply for sponsorship from their employers together?

The answer of overseas Chinese immigrants is yes. Spouses and children will get the same visas as the main applicants. Immigration will only check the employment situation of the main applicant, while his spouse is very free. Whether to work, whether it is full-time or part-time, is up to the spouse to decide. Their children can enjoy the same treatment as locals if they go to primary school or middle school.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.