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If you want some reliable answer, call your French consulate.

Here is what I think in any case:
- If one of your father parents was French, then I believe it should be eligible for French...

That's a good question. It seems to be pretty recent, here is a good article about it:

http://www.washingtonpost.com/wp-dyn/articles/A17079-2004Nov1.html

Actually a friend of mine who doesn't...

Small correction: the name for the birth certificate is "extrait d'acte de naissance" in french.

-- Dr

I believe she would but it might be a bit difficult to get all the paperwork. I'm not sure about your mother and you.

I think she (your grandma) will need at least to get a copy of her birth...

Actually, that's just the NY consulate.

You can find the coordinate for the French Embassy (in D.C.) as well as all the US consulates at http://www.ambafrance-us.org/fr/ambassade/ (in French)
...

No. France doesn't really care if you get another citizenship. US tolerates it, so you can keep your french passport but it won't really recognize it. So in theory, when you are in the US with dual...