I agree with the grammer mistakes. I love how you put in other animals, and the amazing summery. 3 girls and 4 boys... Makes me wonder what's going to happen :]
You have an interesting plot going on here. The only things I noticed were a few grammatical errors. For instance, "I" should always be capitalized and some of your "Your's" should have become "You're". Other than that I really enjoyed this.
Chapter 2 I noticed alot of grammar errors. A few in which you confused you're with your, etc. You might want to fix that.
Chapter 3 There were a few spelling errors but that's pretty much all I noticed.
Overall, the plot seems to be very original. The start was good and you portray the characters in a way that makes it easy to understand. I'm looking forward to how you and your co-writer will build up the plot. Keep up the good writing. :D
I am totally subscribing to this I would love to be a Co-author if you'd like :] I really liked the first chapter a bit short, but that's alright, just try to make them a tad bit longer message me if you want about the Co-author :]