Yes, they can apply for China visa from the Chinese Embassy/Consulate in UAE, you need to send them an invitation letter with the copy of your passport information pages and the copy of your China Residence Permit. But your family also need to provide their passports, fill one visa application form per person, one passport photo of each applicant, UAE residence visa, A No-objection letter from the applicant's company stating his or her position ,monthly or yearly salary;