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?

In 1975, my parents saw an advert in their local Australian newspaper. With the Vietnam war coming to an end, thousands of orphaned children were being evacuated. As part of the American-led Operation Babylift, the Australian government was looking for families who would adopt them. My parents decided to do it.

I arrived in Adelaide in April in a shoebox. I was so tiny that my umbilical cord was still attached. My parents knew that the document they were given, with a January birthday and the name Le Thi Ha, couldn’t be mine. But with the chaos of the evacuation there was no way to find out more.