Were I to choose a household for myself as a child in the world of Harry Potter, it would not be the Weasley house. While I recognize that Molly Weasley loves her children very much, I wanted to cover my ears every time she entered a scene in book 5. She yells
constantly. I had noticed it in the earlier books as well, but it didn't seem so dominant; she sends howlers of course, she yells at the twins and tells them their aspirations are worthless. But in OoTP, the volume is cranked right up and I started to feel that her constant shouting was bordering on abusive.
Back in the day when I worked with children for money, our cardinal rule was "Don't yell at the kids." In any circumstances. Including emergencies. No yelling, no raising of the voice, no shouting "DINNER!" from the middle of a field. You go from spot to spot and talk to children in a normal voice. Yelling, according to my boss, is a form of violence.
I am not the only person who believes it.
This article from 2000 argues that children exposed to yelling and belittling from their parents are more likely to encounter problems with drugs, self-esteem, and suicide as teens than do children who were beaten. While Molly Weasley may not rank up with the top abusers in the Harry Potter series (certainly the Dursleys and a certain Umbridge are worse), but she's not a happy glowing rose to live with either, according to the books.
I don't entirely understand why the Weasley clan is so often seen as some sort of perfect family producing the perfect mates (namely, Ron and Ginny). For Harry, the Weasleys are a godsend because as a family they will take care of him in ways his own family will not. They are warm and loving and open their house to strangers, and as a fan of Harry I'm very glad that the Weasleys are there to give him a little love when he really needs it. The Weasleys represent an alternative for Harry, which is something he desperately needs. That's fabulous, but let's be clear; children who grow up around the kind of yelling we see Molly Weasley doing in the Harry Potter books are not likely to grow up perfect little flowers. Harry has it cartoonishly bad with his family, but Ginny isn't living in witch heaven either.
"The impact of yelling depends on a child's temperament," says Dr. Waugh, author of Tired of Yelling (1999 [see full article
here]. "If children are on the easily anxious and sensitive side, some become very traumatized by yelling. They may withdraw, become depressed or fearful of anger," he says. "Others learn by example and overexpress anger, becoming defensive." Sort of sounds like GoF Ron to me.
Focusing on the overly-loud environment of the Weasley household is an interesting direction to take a character like Ginny; according to Ron, we don't know Ginny very well until book 5, after all. She was too nervous to speak in front of Harry before, so we couldn't see what a little fireball she really is. How does that loud household affect her? Does she swear like a truckdriver the way her brothers do? Does she raise her voice whenever she gets nervous? Does she shout down people she loves when she's worried about them? It would make sense. That's what her mother does.