Show posts from all "My Sites" on one of "My Sites"

Is there any way to allow a post from a site to be included in a list of posts to a main site? We have multiple sites (for each location) that list under a main organizational (home) site (e.g., home.org, home.org/location1, home.org/location2). We would like for our complete list of posts across all sites to show up in the list on the main organizational site as opposed to copying each (location) post under the main organizational (home) site posts. Most plugins requiring building a page to list all posts but this would render our theme useless. Thanks!