[quote author=alphazip ]
Your daughter is a Canadian citizen, but not because of a 1977 law (the 1977 Citizenship Act was not retroactive), but rather because of a law that took effect on April 17, 2009. She is a Canadian citizen retroactive to her birth, but if she has any U.S.-born children, they did not inherit citizenship through her.
Also, I might mention that you (but not your daughter) are a British citizen, due to your father's birth in the U.K. The fact that he became a Canadian citizen in 1947 did not strip him of his British subject status. (Canadians continued to be British subjects after 1947...the status is now known as Commonwealth citizen.) See British nationality flow charts here:
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Thank your for the additional clarifications... always good to be precise on the legislative points. And yes, I hold a British passport as a British Citizen with right of abode. Got it about 10 years ago. Years ago, when I was researching, I contacted an immigration company in the UK who told me I wasn't a British Citizen. A few days later the managing director of the company called me, apologizing, saying I knew far more about the process than his employee did.
The documentation was something of a hassle. I was born to my father's second marriage. In addition to his marriage certificate, I needed his divorce papers. Surprisingly, the British Columbia authorities dug all this up pretty quickly. What was more of a hassle was digging up my father's birth certificate in Liverpool, England but it was eventually found. My mother was born to Doukhobors who originally emigrated to Saskatchewan in 1906/1907... it took some work but I eventually got her birth certificate as well... and because it had her parents origins, gave me an opportunity to do a bit of research there as well.