Inside these Walls was broadcast on CBC back in October, 2016 but I only just discovered this recently. It’s a documentary about an estranged father who has been imprisoned in China for his pro-democracy beliefs and the turmoil it has caused for his family in Montreal. Here’s the description from CBC.
“Wang Bingzhang, founder of the Overseas Chinese Democracy Movement, has spent the last fourteen years in a Chinese prison for the crime of political activism. Although he once abandoned them to pursue his political beliefs, his ex-wife and children campaign tirelessly for his release. Inside These Walls captures the complex range of emotions of a family bound together in struggle and hope.”
Otherwise, you can watch this Ted talk by Wang’s daughter Ti-Anna.