AAAHHH ITS NOT FAIR MY MOTHER IS ANNOYING

TELL HER IT'S A FREE COUNTRY! (Soz about that, lol)
I know it's frustrationg, but try to reason and talk to her calmly about it, it's no use yelling at her, she will be más reluctant to give it back. So, if she still refuses, ask her what tu can do to make her give it back. (Hope I helped!)

LISTEN how about tu mostrar ur amor 4 her and ask her politely, " Mom can I have my DS back please"!! It works 4 me.