Our Glorious Boy Who Would Be Emperor and Fidel
Well, I did some digging:
Justin would have been conceived right around the time P.E. Trudeau married Margeret Sinclair (March 4, 1971), and Justin was born in December of 1971.
They (Pierre and Margaret) didn't visit Cuba until 1976.
Pierre met Margaret while she was vacationing in Tahiti, and she could have gone through Cuba to get there, provided she didn't leave Canada from the West Coast (I probably will never know, and the chances of Fidel being Justin's papa are slim to nil since Cuba and Tahiti are in different oceans).
Margaret did have an affair with a Kennedy while still married, as well as one of the Rolling Stones, but hat doesn't matter right now.
What matters is did Castro and Pierre have an affair....it would fit into Fidel's gay hating attitude and later transformative attitude towards gays in Cuba:
Mariela Castro, Fidel's niece and daughter of Raul Castro serves in Cuba's non-democratic National Assembly and heads the Cuban Center for Sex Education, and is a gay rights advocate....
Mariela has claimed that her uncle, the late gay-executor actually favors same sex marriage but never made it public. There is also some intelligence reports that Raoul (Fidel's brother) is gay.
As to Pierre Trudeau's orientation...who cares? There has been much theorizing that he was indeed bisexual, and this wouldn't really matter unless he and Castro were...bedfellows, so to speak.
So, Uncle Fidel is NOT THE FATHER!