Would like to go to China over our spring break -March 28th-April 7

I have purchased a plan ticket for my 15 year old son and I. We would like to join my husband (who is attending a conference) in Beijing. We would like to do a tourist visa.
We are US Citizens who reside in Dubai. Do we need a it? How long does it take to get one? Does my 15 year old need to accompany me to the Embassy to get it? CAn I have an appointment on Thursday, March 7th to get it if required. Thank you. Paula Barry 971 56 137 1146