Justin Trudeau son of Pierre or maybe even son of Fidel: What difference does it make?

The difference is that neither role model loved democracy more than communism.
His parents were in the Caribbean at Barbados, Trinidad & Tobago and "an unnamed island" in 1971 at the time he was conceived.  Only one island could not be named in those days: Cuba.
That his parents so admired Castro is enough red flags for any Canadian who loves our country.
Just for a bonus, there's a photo that is said to be Fidel, Che and Justin with a mop of hair about a year later on a third trip.

Her hands

Next trip. 

Yes, that's Fidel on the left in B&W

Bonus picture apparently with Che
on a third trip.