In the hallway outside the bedroom, [Harry], [Ron], and [Hermione] stop short to try to listen in to what the adults on the stairs below are saying. Soon, however, they move away, and [Tonks] knocks over an umbrella stand, awakening a screaming portrait that turns out to be [Sirius]'s mother.
A Rather Rocky Reunion
After thinking about the piece of paper he's read, [Harry] watches [number twelve, Grimmauld Place] materialize in front of him. The group walks in the door, Harry says a quick hello to [Molly Weasley], and she pushes him upstairs where [Ron] and [Hermione] are waiting.
[Harry] finally finds [Ron] and [Hermione], and as they tell him about their orders not to give him information, his frustration swells until he blows up at them. He does manage to learn a little bit about the [Order of the Phoenix], though.
[Fred], [George], and [Ginny] unexpectedly arrive, talking about the meeting of the [Order of the Phoenix] that's happening downstairs. They also tell [Harry] about [Percy]'s fallout with the [Weasley family], and how [Dumbledore] and [Harry] have been cast as untrustworthy figures by the [Ministry of Magic] and the [Daily Prophet].
[Mrs. Weasley] lets the group know that dinner is forthcoming, and once [Ginny] follows her out, [Harry] speaks with [Ron] and [Hermione] for a moment more about his frustration, and Harry learns about [Kreacher], the [house-elf].
Chapter 5 - "The Order of the Phoenix" - In which Harry learns of Sirius Black's family background, and Molly and Sirius have a row regarding what is best for Harry.
En route to dinner [Harry] learns from [Sirius] that [number twelve, Grimmauld Place] is the [Black family] house, which he now owns.
Dinner at Headquarters
In the dining room, [Harry] finds a number of people, including the [Weasleys], and chats with [Sirius] about their respective summers as [Molly] finishes dinner. They are interrupted when [Fred] and [George], attempting to save time, launch a [cauldron] and a knife at Sirius, but Molly's reprimands are cut short and dinner begins.
As dinner progresses, [Tonks] changes the shape of her nose for entertainment, [Lupin] and [Arthur Weasley] discuss the [goblins], and [Molly] manages to shoot a few choice words at [Mundungus Fletcher]. Finally, after a generous dessert, the group prepares to go to bed.
The Mission of the Order of the Phoenix
Just before everyone heads to bed, [Sirius] stops them all short to offer [Harry] information about [Voldemort]. [Molly] is all but outraged and protests, insulting [Sirius] in the process, but after calm discussion from [Arthur] and [Lupin], she succeeds only in sending [Ginny] off to bed.