Stanley Johnson is applying for a French passport – just as his son ends free movement due to Brexit.
The 80-year-old boasted “I will always be a European” and said he’s taking advantage of his family links to France.
From 11pm tonight, free movement between the UK and EU will end.
There will no longer be an automatic right for Brits to live and work on the continent.
And while short trips will be allowed, Brits will need to pay for a visa waiver from 2022.
However, those with dual UK-EU citizenship would be able to continue to take advantage of free movement.
Mr Johnson Senior, a Remain-voting former Member of the European Parliament, spoke to RTL radio.
He said: “If I understand it correctly, I am French.
“My mother was born in France, her mother was totally French as was her grandfather.
“So for me it is about reclaiming what I already have. And that makes me very happy,” he said.
“I will always be a European, that’s for sure. One cannot tell the British people: you are not Europeans.
“Having a tie with the European Union is important.”
His son Boris was the public face of the Leave campaign in the 2016 referendum.
He insists Britain can “prosper mightily” as a fully sovereign nation outside what he sees as an overly bureaucratic EU.
But he struck a softer tone yesterday as Parliament approved the 1,246-page Brexit deal.
He said: “This is not the end of Britain as a European country.
“We are in many ways the quintessential European civilisation… and we will continue to be that.”
Officials are expecting disruption when the UK leaves the EU tonight, despite a trade deal being agreed.
The UK is still leaving the single market and customs union, forcing exporters to fill out customs declarations from tonight.
Holidaymakers will need to have a passport no older than nine years and six months in order to cross the border.
They must also check they have valid travel insurance and ensure they won’t be hit by mobile roaming charges.
People will need an International Driving Permit to take their car to the continent, and more checks on taking pets abroad.