Read you appeal and read the reference Law in hand.
1. Be noted "L de F" is not the sole source of official recognition for asked events.
2. If your grandfather was bestowed honorary French nationality due to his siding with French during Second WW, - and at that point someone should have mentioned something about adding the children (your father) to the livret then there is a case in hand. This is what you reveal now - right!
3. It is after 34 years obvious that your father and you should have had to produce a "L de F" in order to take French nationality. What I see here is that the very "L de F" seems to be missing hence suggested to first log on to Ministry of Foreign Affairs website regarding how to request a duplicate "livret de famille".
4. Now after some 34 years your father and you after seeking duplicate "L de F" need to provide all the other documents for all the events that now needs to be documented such as your grandfather's second WW benefits till 1979 that he or his family (was supposed to be) receiving, your father's birth certificate and yours too - possibly with official translations and get hold of a local legal hand to process all these documents as your case can still be re-opened provided legal journey is taken after seeking duplicate "L de F" is my view.
5. But do remember your father's "carte d'identité" is most important document as French passport does not prove once nationality only a carte d'identité does, and that is what is required to get a French passport which is what you are seeking if I may correctly see through. If your father has no carte d'identité, ask him first to apply at a local Consulate for a “replacement" stating he has "lost" it! He'll have to make a written declaration that he has "lost" his card and have made "every effort" to find it with a declaration.
6. If authorities raise the issue of the missing livret, just tell them your father never got one and let such and such authorities sort it out. If you're side are nice about whole thing and just insist it was an innocent mistake but support with paper documents, like grandfather’s benefits till 1979, your father's marriage certificate, his and yours birth certificates etc. etc. the authorities will find some way to make all these happen.
I see after reading your reply mail that your grandfather and his family (i.e. your father) enjoyed the French nationality and its benefits till 1979 abut now your father and you are seeking French nationality. The case is overall good one and can be followed based on your reply which is basis of this clarified reply to that of my earlier stance.
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