It is estimated that roughly 2000 children were born to black GIs and British women during the Second World War. They were labelled by the African-American press the ‘brown babies’—a name far preferable to that given by Britons, namely ‘half-castes’. All the children were born illegitimate as the US army would not allow black GIs to marry their white girlfriends. For nearly every British ‘brown baby’ their American father was a total mystery. Whether or not they were in a children’s home or living with their mother or grandmother, most of Britain’s ‘brown babies’ were told little or nothing about their birth fathers, and the little they were told was often inaccurate or misleading. This led many of them, once they were older, on a search for their fathers. This article charts that search and the love affair they developed with the USA. In the process, it reveals what being part-American means to these GI offspring in terms of their identity and allegiance.