Will these brothers grow up to be arch-rivals or the best of friends? See what the boys think and start a conversation with your kids about rivalry in your home. Get more resources on sibling rivalry at GreatSchools: http://bit.ly/1HtZV02 GreatSchools is a nonprofit organization that helps millions of parents get a great education for their children. Visit us at http://www.greatschools.org, or find us on social media: Like GreatSchools on Facebook: http://www.facebook.com/GreatSchools Get gr