Q:

My brother and his cipher

NOTICE: true story ahead, you can skip it if you want and go straight to the puzzle
I was reading a book when a scrap of paper fell out. Looking at it, I realised that there was a code on it. Now before you get all excited about hidden treasure and stuff, I instantly recognised my brother's handwriting. After attempting to crack the code, and failing, I asked him for the answer. I did get extremely close to cracking it though! Anyways, here's the code:

Text version:

Can opens Incca lass orel case

Note:
The only important part is the text version; that's all you need to solve it.

Hints:

 My brother is ten.

Also how did I come close to cracking it? I noticed that some parts of the code seemed like words, for example saying it out loud makes it seem almost intelligible.

A:

I think you simply...

Remove the 3 ca's in the sentence. So:
[Ca]n opens Inc[ca] lass orel [ca]se = No pens in class, or else!
Which does sound like something a school teacher might say. Some classes only allow pencils. 
And I did find it when I said it all out loud and noticed the middle part sounds like 'in class'.

