(Again with the trying to be concise, so I just dropped the paragraphs where I agree with what you say but have nothing to add.)

He does fail, really. Above all he shouldn't have avoided Harry so much.

And she's evidently not too happy about Sirius, because she feels he'll put Harry in danger, and perhaps her own children too in the process. You have to wonder to what extent the traumas of her past - her brothers dying in the previous war - influence her fear for her family this time around. Her brothers were twins as well, so it might not be too much of a stretch to guess she makes a link on some level with Fred and George.

It does work. And since I'm reading every Twins scene as confirmation or disproval of my theory about their characters now, I looked a bit again at who says and does what. Fred still has most of the daring and outgoing remarks, while George is the one described as the most resentful about the Percy thing.

Note also her casual "Oh hi, Harry" entrance, confirming that she's stopped pining over him and trying to focus on other things. This is the book where she really becomes part of the gang, along with Neville and Luna, so her character needs more depth that's being provided in bits and pieces here. George also makes a remark about her considerable hexing skills.

Agreed, Mrs. Weasley's position clearly isn't the ideal one either. Perhaps because of her history (see above), her take on how to treat Harry is too protective and as a result counterproductive. It's kind of hard to say to what extent she's right about Sirius. He doesn't really seem to overestimate Harry that I can see. He's a lot closer to the right tack than she is.

Yeah, that much is clear. The family tree is great, allowing character development, plot clues and discussion of the theme of racial purity at the same time. I'm wondering now, though... is Kreacher's apparent devotion to Voldemort here an act? I'd have to reread DH to be sure, but shouldn't Kreacher resent Voldemort and his followers for what happened with Regulus?