A commercial DNA test has helped an Australian woman discover that she has a twin brother living only a short flight away. Chantal Doecke was evacuated from Saigon as a newborn in 1975 and brought to Australia during Operation Babylift, an international effort to move children out of Vietnam as the war came to an end.

The joy, disbelief and shock of discovering I had a brother the same age as me came with a million questions. How were we separated and why?

A commercial DNA test has helped an Australian woman discover that she has a twin brother living only a short flight away. Chantal Doecke was evacuated from Saigon as a newborn in…