Macau-Guangzhou-Hong Kong

Hi, I'm studying in Guangzhou. My parents are coming to Hong Kong and they want to spend just one day in Guangzhou. If on the early morning we take a boat (from Hong Kong) to Macau, cross Macau's border, from Zhuhai go to Guangzhou and then on the night take a train to Hong Kong (from Guangzhou) could it be possible to get 24 hours direct transit (if I show my parents train ticket to Hong Kong at Macau's border)?