requirements for appling a tourist visa to china from tunisia

I think your wife and kids can apply for a Tourist L from the embassy, but they may be required to provide additional documents besides their valid passports (Your kids as U.S. passport holders must submit two application forms with two photos), ful-filled application forms, round-way air tickets and tour itinary, for instance, residence permit and NBI clearance from the local security bureau. Anyway, please contact the Embassy directly or go there in person to consult about your issue.