It happened to Hungarians like my grandfather too.

Edit: not that anyone ever talked about it (or anything else from this period, for that matter). I learned it from my father shortly before his death, although the phrase he used was "undesirable alien" rather than "enemy alien". He also told me that the only time his parents spoke Hungarian in his presence was when they argued. But he dismissed the idea that there was a link between how they were treated and his parents' determination to bring up their sons to be so thoroughly English; assimilation was just the norm at that time.