Of course you are.

General guidance here@

http://www.ind.homeoffice.gov.uk/ind/en ... forms.html?

Your wife is not eligible.

 

Yes, I agree, you remain a British citizen. You may also be a citizen of the country where your parents were originally from (depending on the country). Neither Britain nor Canada limit the number of citizenships you can have.

You need to apply to register your children as British citizens before they reach adulthood. You can look here for forms (http://www.ind.homeoffice.gov.uk/ind/en ... ality.html) or inquire at the British High Commission in Ottawa.

Your wife does not qualify to be registered as a British citizen, but, as your spouse, can move to Britain with you and apply after several years of residence.