This Trill was the father of Arjin and a girl. He was not joined to a Symbiont, but wanted his daughter to be. He was a pilot instructor on Gedana post for forty years. After his daughter was successful in passing the rigorous trials for being joined symbiont, she decided not to be joined, which went against her father's wishes. She left home and the two never spoke again. Because of this he said to his son (Arjin), it falls upon him (Arjin)to be joined. Arjin's father died in 2369. (DS9: "Playing God")
Nine Trills were present when the Dax symbiont was transferred from Curzon Dax to Jadzia Dax. Six of them wore medical gowns, so might have been doctors. The remaining three wore civilian clothes and could possibly have been members of Jadzia's or Curzon's family. (DS9: "Emissary")
The female surgeon was played by regular extra Tyana Parr who received no on-screen credit for her appearance.