Law / Am I Polish (and eligible for Polish citizenship)? [6]

Hello! I have some questions regarding whether I and my father are eligible for polish citizenship. I will be getting more information soon, but I'm very excited about the possible prospect of being a Polish citizen, and I would like to know before I start to do a lot of digging if there is a chance.

My great grandmother moved to Canada in the 1933 with her 3 kids. Her husband is also Polish, but didn't end up moving with them to Canada. My grandmother was born in Canada shortly after they arrived in Canada. Her mother (my great grandmother) never remarried after her arrival to Canada. My Grandmother ended up having 5 kids in Canada with a non Pole. I think my grandmother got married before she had her kids. My father was born in 1959. No one in my family has ever held public office in Canada, and no one has ever been in the military.

I'm able to get more information if necessary, but if someone that's familiar with Polish Law can tell me if there is any chance of my Father obtaining citizenship, and if I will be able to obtain it as well it would be much appreciated.