Okay, I might have saved them under a wrong name then
I still think that it rather sounds as if she'd be talking about a lover there than about a friend (there's also that part about people she'd take with her to an island and calling them being the l"oves of her live", so it feels a bit different, but I might as well just be misinterpreting things)
If they weren't a love couple ever, well, then they weren't. No big deal, either.
And I have to add this:
I don't mean to judge on anyone's impression, but I think that you can't really compare Lou and Charlotte when talking about their childhood and the way they feel about it.
Take my parents for example, both my mom an my dad both know about Jane Birkin and Serge Gainsbourg, but neither one of them knows "who the hell" Jacques Doillon is.
And Jane's talking about Serge in every single interview she gives, even nowadays.
Not only do Lou and Charlotte have different personalities (as, siblings use to do) they were treated differently only for who their fathers were.
(Anyone ever heard Kate Barry talk about her childhood? I'd be really interested in that since I feel that no one really cares for anything before or after "Jane and Serge")
She might not be as great as she want's people to see her, but she definately is different, and I like that.
And I, too, love that “What a lovely moustache.” part