Boris Johnson's father Stanley Johnson has said he's applying for French citizenship.
Stanley Johnson told broadcaster RTL on Thursday that he was in the process of "reclaiming" his French identity.
It comes as the Brexit transition period ends tonight, December 31, at 11pm and a trade deal has entered law after being given royal ascent by the Queen.
He said: "It is not a question of becoming French. If I understand correctly, I am French.
"My mother was born in France. Her mother was completely French, as was her grandfather."
He told RTL he is putting together a French citizenship request, adding: "So for me it is a question of reclaiming what I already have."
From January 1, 2021, travel to the EU, Switzerland, Norway, Iceland or Liechtenstein will change following the end of the Brexit transition period.
It also marks the end of freedom of movement rights between the UK and EU.
UK citizens will be able to go on holiday or take a business trip to EU countries but it will not be as straightforward as before.
For British citizens planning to move after January 1, the automatic right to live and work in the EU ceases when the transition period ends.
This means they will need to apply for residency in accordance with that country’s immigration rules.
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