Can the family members of criminal complaints sign on their behalf?

Legal analysis: No, criminal appeal is a lawsuit filed by a criminal litigant or his legal representative who refuses to accept the judgment or ruling of the people's court of first instance and requests the people's court at the next higher level to cancel, change the original judgment or retrial according to legal procedures within the statutory appeal period.

Legal basis: Article 180 of the Criminal Procedure Law of People's Republic of China (PRC). Defendants, private prosecutors and their legal representatives have the right to appeal to the people's court at the next higher level in writing or orally if they refuse to accept the judgment or ruling of first instance of local people's courts at all levels. Defenders and close relatives of the defendant may appeal with the consent of the defendant. The parties to an incidental civil action and their legal representatives may appeal to the part of the incidental civil action in the judgment or ruling of first instance of the local people's courts at all levels.