I'm a 67 year old US citizen who was adopted at birth in the US. Both of my biological parents (deceased) were Canadian

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I am sorry to hear of this difficult situation.

When you were adopted in the US you may have lost your right to claim Canadian citizenship because you were getting that only through your parents and not because you were born in Canada. When you are adopted your adoptive parents became legally as if they were your biological parents. So it may be very hard for you to be able to get citizenship by descent because of this issue.

It would make sense to try. Here is a link to the information that you will need:

https://www.canada.ca/en/immigration-refugees-citizenship/services/canadian-citizenship/proof-citizenship/about.html

Does that help as a starting point?

But that's a different situation. Adoption really changes everything.

For example, if your biological parents had died without a will you would not inherit. If your adoptive parents died without a will you will. Your birth certificate shows that you are the biological child of your adoptive parents essentially.

I would say the best way to pursue it is to apply. You'll only know what they'll say when you apply. There is no clear answer to your question. They have so much discretion.

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