Shi Boyu is worried his father, who has a degenerative brain condition, is going to die in a Chinese prison and never get to meet his grandson.
Shi Zongfa, 68, remains in pre-trial detention in China's southern city of Guangzhou after being arrested two years ago and charged with bribery.
His son, an Australian permanent resident living in Victoria, believes the charges are made up and retribution for his father accusing local authorities of corruption.