Question from FAH, Thailand

I am Thai citizen and already planned to go to Guangzhou in May 2015 with my family (5 person). Do we all need to go to apply for VISA or myself can go alone with all documents? My parents are the couple of more than 60YRS old, so I didn't want them to go and wait at the embassy. Also, shall we have to write the form individually by own handwritten or I can fill for all and then ask their signatures only?

Thank you for your help