[xzins]

Yes. It’s in his bio.

He became a Canadian citizen while in Canada. His wife did not. At the time under the then-current Canadian immigration law, Canadians could not hold dual-citizenship, so the implication is that Senior had to renounce his Cuban citizenship to acquire his Canadian citizenship.

Following that same pattern, when he became a US citizen, he renounced his Canadian citizenship.

[Brown Deer]

...so the implication is that Senior had to renounce his Cuban citizenship to acquire his Canadian citizenship.

not true: "Although Canada restricted dual citizenship between 1947 and 1977 ... migrants becoming Canadian citizens were not asked to formally prove that they had ceased to hold the nationality of their former country."