
Fidel Castro (August 13, 1924 – November 25, 2016)
versus
Pierre Trudeau (October 18, 1919 – September 28, 2000)
Probably, only Margaret knows for sure. But there seems to be something about the rumours of Castro being his true father. Their similar look is the first indicator.
Margaret states that three weeks after she married Pierre Trudeau when she was just 22 years old, she got pregnant with her first child. That kind of puts paid to Fidel Castro, doesn’t it? Well, doesn’t it?

Looking at Castro’s chart, there are three obvious links: Justin’s Mars is conjunct Castro’s Uranus; Justin’s South Node is within 4° of Castro’s Mercury; and, finally, Justin’s Ascendant lines up with both Margaret’s Saturn and Castro’s Neptune in a wide conjunction. Is that enough?

What links Pierre’s chart with Justin’s? Justin’s Midheaven/Saturn conjunction is opposite Margaret’s Ascendant and Pierre’s North Node; Justin’s South Node is within 5° of Pierre’s Neptune; and, finally, Justin’s Ascendant is within 4° of Pierre’s Mars. Again, not a huge amount of links, but definitely some important ones.
Is this photo proof of anything? No, because the child is another of Margaret’s boys, not Justin. When Castro died, Justin had nice things to say about him, and that got him into trouble with the Canadian Press. For that reason, he didn’t attend Castro’s funeral.

So, to answer the question posed in this post’s title: no, we cannot prove Justin Trudeau’s paternity.
Pierre married Margaret on March 4, 1971. Justin was born on December 25th, 1971, exactly nine months and three weeks later.
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