Actually, you don't have to introduce all the characteristics of your characters like this. You can introduce how they are and what their family is like throughout their story. Let the reader get to know them. Don't spoon feed your readers.  Involve them in the discovery. 

Hey Caruto, so I'd like to give out my thoughts on your work. Firstly, the summary, there should a specific conflict that would pique the curiosity of the readers. It's not only because this is a book about friendship, the main conflict should be indicated in the summary. What would make your book unique? What would bring your characters close? What would develop their character? You have to tell us the problem they'll face (not necessarily how they'd handle it.) Would they discover a talking kitten in a box? Would someone be struck by a curse and the only way to save their friend from a coma is to dive into a hidden world to defeat the one who put the curse? Would they-- (okay I'm going overboard the genre isn't even fantasy hahaha but you get my point.)  Grammar wise I don't see any issues. It's flawless even.