Hopefully a quick question - I am a US citizen currently residing in the UK on a visa. I am traveling to the US for 2 weeks with my wife, who is a British citizen. We do not yet share a last name (due to just not filing the paperwork yet and just being married recently). She does not have any visas apart from the standard ESTA and there are no other further requirements, such as money, which we would need to worry about.
I've read online that since we are a family we should join the same line together when coming into the US border at the airport. However, because we don't share a last name, would this still apply? Should we just use our own appropriate lines? Would there be any issues with using our own lines?
If we do use one line only, which line? US citizen or non-US?