Originally Posted by
JBord
I'm not sure that this will help you, as I'm not sure why they're asking for nationality at check-in...and yours may be different from your parents'. Typically I thought it was just passport information. So perhaps don't take this as advice and ask WizzAir instead so you don't have problems at boarding.
That said, "nationality" usually refers to your country of birth.
For example, I have a friend who was born in England, but became a US citizen several years ago. His nationality is British, but his citizenship is US.
His nationality and citizenship is US if using (or otherwise eligible for) a US passport for US citizens. His nationality and citizenship is British if/when using the most common type of British passport.