Mr Johnson admitted Brexit had proved particularly divisive in his family, after his brother Jo Johnson quit the government just weeks ago over the PM’s plan.
“We’re a very tight knit, close knit family,” he told Sky News.
“And we all love each other very much. But there’s no doubt about it – we do disagree about this issue. I mean, there are other members of my family who are Leavers but yes, in common with many families around the country there are difference of opinion.”