Hello. I Have some information that might be of assistance to you. David is the grandson of Adam Costner. If you would like more information concerning the Costner family history, you may contact my mother Betty Pierce Costner, her e-mail address is bcp@charter.net She has much information concerning the original Kastner family history, as she has written a book called Costners "Traveling the Roads of Life". If I can be of any futher assistance please don't hesitate to contact me, I am Lorrie, Betty's daughter. Have a great day.