Can my son file our visa applications in our behalf.

My family will be travelling to Xiamen to visit family and ancestors there on March 17 to 20,2017(4 days),which includes me,my wife and two sons aging 26 and 29 years old respectively.We are kind of busy and have some difficulties to be off from work because we are working in a hospitals.I am just wandering if it is alright that one of my sons will be allowed to file personally in your Consulate office our appications in our behalf.
Thank you for any answers and informations.

ps; we will be coming from Philippines to Xiamen,China.