Halcomb Twins 1964-1966

They were born in Sealy Lake, Montana between the years of 1964 to 1966. One boy and one girl. The father was Roy Halcomb. Mother was Norma Kilbury Taylor, but went by Halcomb. Roy had 6 other kids by previous wife. He moved from California to Sealy Lake, Montana. The parents were not married, then moved back to California without the twins. I am Norma's daughter, one of 6 other children. I would like to find my brother and sister. If you know of Roy Halcomb, or heard of the twins, please respond. The twins aunt could be Ruby Halcomb Comfort. Her husbands name was Jim. They also lived in California at one time. The twins could possibly have been adopted out. If you recognize any of the names, please respond.
Thank You.