How did my brother get like this. Is my mother weak at parenting?

He's fifteen and constantly being disrespectful, making a mess around the house and not cleaning up after himself, always on his iPad, not listening to parents.
I was watching something with earphones on and over heard some kind of arguing goinng on.
He was going on another one of his non stop barkings. Like it just sounds like a dog barking. "MOM WHERE IS MY FOOD. WHY DIDN't YOU MAKE ME ANY FOOD. EHDIWJEHWJDHDWIWISIDIDjxjsjsxhxusiJ". She didn't say anything but then When really she prepared lunch hours ago and he never comes downstairs on time when they call him. I hear him barking back at my mother basically everyday. With me he's just consantly insulting me. Is this normal fifteen year old boy behaviour.
Added (1). My mother screams at him everyday and the punishment she always resorts to is confiscating his iPad. But nothing changes WHEreas my dad is the kind of easygoing person that's that doesn't care, floating around in the background either drinking or sleeping

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Ipad home button broken? Professionals please?

A long time ago I got my ipad repaired because it wouldn't charge when plugged in, something was broken inside of the ipad and I took it to a local electronic "repair" place. They had to replace the screen in the process. They took a long time to fix it and they did except for the fact that there's 3 new problems. The microphone doesn't work anymore unless you use headphones/earbuds, the ipad home button is completely loose, and some places on the screen don't work. Before the home button would still work when I pressed down on it, but occasionally it would wiggle of it place and I had to try to make it to how it was before or else It wouldn't work. A couple days ago I dropped my iPad accidentally, and it knocked the home button out of its place and when I pushed it back in, it was out of place again and now I can't use the home button. (Sorry if I poorly explained this, I don't know how else to.) I managed to get into settings and turn on assistive touch so now I can use touchscreen home button. I'm probably able to wiggle it back into place but I don't understand how… As for what it looks like since I was unable to use a picture here, it looks lodged in and you can see the some of the inside of the ipad. The button is extremely wiggly and loose.

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