One of the many painful ironies of all this is that Boris Johnson has at least one child that was born a Belgian citizen.
I don't know how this panned out in the end, but back in the early 90s when he was the Spectator's corerspondent in Brussels, submitting regular pieces of anti-EU invective, his wife became pregnant.
Meanwhile, the Conservatives under Major had passed a new immigration law designed to stem migration from the Indian subcontinent.
The gyst of this w that people whose parents were not UK-born could not expect any offspring born outside the country to have automatic UK citizenship.
The four grandparents of Boris's sprog, though UK citizens, were born outside the UK.
There was quite a lot of schadenfreude about this at the time.