"All the Weasleys have red hair, freckles, and more children than they can afford."
     -- Draco Malfoy

"Why is everything I own rubbish?"
     -- Ron Weasley

The Weasleys live in The Burrow, a ramshackle house of four or five stories near the village of Ottery St. Catchpole. All of the Weasleys have bright red hair. The family is relatively poor, but they still manage to send all their kids to Hogwarts. They are considered to be one of the prominent Wizarding families, although their lack of money and acceptance of non-pureblood wizards and even Muggles makes people like the Malfoys look down on them. 

The Weasley family consists of:

• Arthur Weasley - head of the family, works for the Ministry of Magic
• Molly Weasley - Arthur Weasley's long-suffering wife
• Bill Weasley - Grown son who currently works for Gringotts as a curse-breaker in Egypt
• Charlie Weasley - Grown son who currently works with dragons in Romania
• Percy Weasley - Grown son who recently left Hogwarts and is now employed by the Ministry of Magic
• Fred Weasley - twin with George, currently at Hogwarts
• George Weasley - twin with Fred, currently at Hogwarts as well
• Ronald Weasley - currently attending Hogwarts, best friend of Harry Potter. 
• Ginny Weasley - Currently attending Hogwarts, has a crush on her brother Ron's best friend, Harry. Ginny is also friends with Hermione.

• Other relatives:
• Bilius - Uncle, supposedly had once seen a Grim and died within twenty-four hours (PA
• Grandfather - had owned the old and battered wizard chess set that Ron now uses (SS
• cousin of Mrs. Weasley - this poor fellow isn't spoken of in the Weasley family, as he turned out to be an accountant (SS
• other Weasley cousin
• Owls:
• Errol - aged and decrepit, Errol is a family owl. He barely survives some of his deliveries, but he's still hanging in there.
• Hermes - This owl belongs specifically to Percy.
• Pigwidgeon - Known not-so-affectionately as "Pig," this tiny brown owl belongs to Ron.
• The "Weasley Cousin"
• Rowling had created the character of a female cousin to the Weasleys for book four. However, that character disappeared in rewrites. Here's what Rowling has to say (Nr) about the Weasley cousin:
Q: Last time we spoke you said there’d be a Weasley cousin. It didn’t appear. You’ve deceived me! 
A: It got pulled. Sorry about that. What happened on Book Four, and one of the reasons why it was easily the most difficult to write, which had absolutely nothing to do with Harry being famous or me being famous, was that for the first time my plan fell down. I got halfway through and realised there was a huge gaping plot hole. The two ends just didn’t meet. It was entirely my own fault: I should have had the sense to go through it very carefully before I started writing. So I had to do an enormous amount of unpicking and in the process I’m afraid the Weasley cousin disappeared. 
Q: Will we see her again? 
A: Possibly. I really like her as a character but it’s quite a complex plot I’m dealing with so I’m not sure that she’ll fit anywhere else. She’ll be the "character that might have been." 
• calculating the ages of the Weasley children [paraphrased from a post on HPfGU by Michelle]
• In PA it's stated that Gryffindor haven't won the Quidditch cup for 7 years. It is also stated (in either PA or PS can't remember which) that they haven't won a the cup since Charlie was Seeker. In PA, Ron has already been at hogwarts for 2 years so 7-2 =5, so that's 5 years between Charlie leaving Hogwarts and Ron starting Hogwarts. Add on the severn years you spend at Hogwarts 7 +5 =12 so you get 12 years between Charlie starting at Hogwarts and Ron starting at Hogwarts. That's 12 years between Charlie and Ron. Since we know that Ron was born in March 1980, Charlie must have been born in 1968 or 1969. Now the twins are two school years above Ron, and Percy is two school years above the twins. That's roughly 4 years between Percy and Ron and 12- 4 = 8 years between Charlie and Percy (roughly: could be nearer 7 or 9 as we're using schools years).