Samuel Howard, Matilda Howard and Rebecca Howard Brother and Sister

According to a History of Hendricks county under the sketch of Lucian Funkhouser the mother of Rebecca Howard is identified as Ellen Ford ie Fort.  Matilda Howard's parents are also identified as Samuel Howard and Ellen Fort.  So are the parents of Samuel Howard.  I have not verified that John B. Howard is their brother, but odds are good that he will turn out to be a brother.