Write a Beginning Scene

"Do you ever shut the fuck up?" I sighed rolling my eyes at my sister's never ending complaints.
"Look. All I'm saying is-"
"I know what you're saying. We go through this every day"
"Ok but we should move camp south. Somewhere just a little warmer"
"You know why we can't do that"
"I know why you say we can't"
"You've heard the traders! You know what conditions are like down there!"
"We could find somewhere that's isolated still! We don't have to go all the way. What about...like...halfway?"
"No. We've discussed this. We're established here. We have a good thing going. We have a good meeting point with traders and no one can find us or hear us."
"Mom would've let us move."
"Yea, well, mom isn't here anymore. You wanna join her?"
"You wouldn't."
"Try me. You aren't the only one I have to keep alive."
"I hate you."
"I know. Now shut up and gear up"

We live in North Montana. There's a north and south to almost every remaining state. We live the furthest north you can get without being in Canada. You can't get any further north without special permission from the government, and I use the term government loosely. President Something runs things now and he decreed that every female aged 15-19 must serve between 1 and 4 years in service in the White House as a maiden. The females who go though, rarely come back, and when they do, they never come back the same. Most are just permanently scarred by First Lady Analeise. The rest have had one or more children for the President's family, more like child army. Once the children are born, they are never seen again. Shipped off to some factory somewhere is the rumor. The shortage of females leaving his service though means a there's a shortage of children and thus a shortage of new females for the President's pleasure. Now there's a bounty on young girls. And my sister, Amy, turns 15 this week.
We don't know who Amy's dad is but mom had her after being in the President's service. She hasn't spoken a word since she returned. She often just sits and stares at the wall. She'll follow commands if I ask her to do something like eat or bathe and luckily she goes to the bathroom on her own but she doesn't do much else.