Yesterday, Manny drew a self-portrait on my bedroom door in permanent marker. I thought Mom and Dad were really going to let him have it, but as usual, I was wrong.
请教这里的I thought Mom and Dad were really going to let him have it是什么意思？
我把你发重复的那个贴删了哈。。
就是要“教训教训他”的意思啦。
permanent marker，是不褪色水笔，颜色是擦不掉的。我看到你也标红了，和你解释一下。
昨天，曼尼用擦不掉的麦克笔在我房门上画了幅自画像。我想爸爸妈妈这回真的要好好教训他一下了，但是跟往常一样，我又想错了。
这段前面有一句：Mom and Dad protect Manny like he’s a prince or something. And he never gets in troubles, even if he really deserves it.
根据上文，这里的let him have it应该是惩罚惑教训的意思。
我来做事后诸葛亮（早干嘛去了？）：
let sb have it ---(sl) shoot, punish, etc sb
