The character in TEH book I'm writing comes from a dysfunctional family. How do I write her?

Okay, her father died when she was a baby and she lives with her five cousins because their family can't support them. When she is 11, her mother remarries a man who seems nice and his daughter is her best friend, but as time goes on and the plot of the story gets worse for the characters, it is revealed this guy is a relapsing alchoholic. Her mom is struggling to take care of seven kids (the girl, her stepsister, and five cousins) and becomes depressed to the point where she can barely function. One of the cousins has anxiety and hypochondria, which I myself have, but I don't know how to write the effect of this on the rest of the kids. (Also, all of this is happening with the impending apocalypse and people are dying and there are corpses piling up outside.) Another of the cousins starts doing drugs and drinking, despite being only 14, and this has a huge effect on the family. Any help in writing this?

?2015-09-06T18:18:44Z

Try researching the topic. Research alcoholism and drug dependency, maybe watch a few episodes of "Intervention". Watch and see how family dynamics are altered. Research effects of the former on families and children. Research depression: causes, effects, treatments long term and short term effects on families. As far as how it speficically affects your characters., only YOU can answer that, only YOU know how strong their bonds are with each or how weak, only YOU know the strengths and weaknesses of each one. Only YOU know the family dynamic, only YOU know how it effects thir relationships with others and neighbors, the family finances, the state of the home and more.Only YOU know how it personally affects each in the family, thier life outside of the family, work and school.

You've got a lot of work ahead of you if you are serious, get cracking.