I have 2 Anton Demshars in my family tree, a father and son! The father was born in June of 1861 and is the son of Lucas Demshar and Mary Kilyan or Calish. As far as I can figure he was married three times. Once to Barbara Lesner, then Inez Copple and finally Jessie May Fridell. His son is named Anton Lesner Demshar and is from the first marriage. He was born 30 October 1880 in Selca, Yugoslavia.
Does this match anything you have?