Invite family in business trip

You can inlude your family in this trip, however, they should apply for a tourist vsia to China, but you apply for a business visa to China because the invitation letter from China side doesn't invite your family to go to China for business.

You should prepare the following documents to apply for business visa:
(i) Original passport which has more than 6 months left before it expires from the date of application and sufficient blank visa pages.

(ii) One completed Visa Application Form with a recently-taken passport photo (only 2 inch * 2 inch color photo with light background like light blue and white is acceptable);

(iii) An invitation letter from the host company or the partner in China, or a letter from your company (Original letter, copy or fax are all acceptable).

Your family needs to prepare the following documents to apply a tourist visa to China:
the first two documents as same as you,
round-trip flight tickets
hotel booking in China