Passing data from table view cell to tab view controller child via segue

I am trying to figure out how to pass data from a tapped tableview cell into a child view controller in a tab bar view controller. This is what I currently have:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?){

if segue.identifier == "edit"

{

let cell = sender as! UITableViewCell

let indexPath = tableView.indexPathForCell(cell)

let roomController : RoomViewController = segue.destinationViewController as! RoomViewController

let room : Rooms = frc.objectAtIndexPath(indexPath!) as! Rooms

roomController.room = room

}

}

}

I know conceptually I need to pass the data thru my tabview controller, but I'm not suer how to do this.

Thanks in advance