BuddyPress.org

I only want multiple child sites with serparated BP instances

@plose2009bx in that case, http://buddydev.com/plugins/buddypress-multi-network/

@plose2009bx there is one instance of BuddyPress per WP multisite. You would see the BP admin screens via Network Admin settings. There are plugins to have separate instances of BP per WPMS subsite like those mentioned in this trac ticket.