I am hoping you can help me with some advice on getting proof of Canadian citizenship. All avenues I have explored seem to have a dead end or loop back onto forms requiring documents that I do not have. I have never lived in Canada only spending short holidays there. My mother was born in Nova Scotia. My father became a Canadian citizen at the outbreak of WW2 to join the Canadian Air Force. He was an Australian born citizen. I now also hold Australian citizenship but live in Thailand. In brief, my parents were Canadian citizens and I was issued with a Canadian passport as a child in 1967. I still have the passport. In the passport it states that I am a citizen by registration of birth abroad, certificate no.xxxxx. But I do not have the certificate. As a young man I applied for a Canadian passport but was refused because of the laws at that time (subsequently amended in 2009). I have copies of my birth certificate that state my parents Canadian citizenship, but these are UK documents. It seems that I need, at least, one of my parents birth certificates to complete any application form. This I do not have they and they are both deceased. What (if any) options do I have to continue my efforts to re-establish my citizenship? Thank you in advance for your assistance .