The sister of Tory Eurosceptic Jacob Rees-Mogg who is standing as a Brexit Party candidate has said her brother understands she feels it is "for the sake of our country".
Around 700 people attended a pro-Brexit rally on Saturday afternoon led by Nigel Farage and Annunziata Rees-Mogg, who hit out at Britain's "broken" political system.
Confirming she will stand for Nigel Farage's new party in the East Midlands region in the European elections on May 23, Ms Rees-Mogg slammed the Conservative Party as being "confused" with "no leadership" under Theresa May.
Ms Rees-Mogg, who twice stood unsuccessfully for election to Westminster as a Tory, was asked if she had spoken to her brother about her decision to stand for the Brexit Party.
She replied: "Of course I have. My family is incredibly important to me and Jacob and I get on extremely well.
"He understands that I feel this is the only way to get everyone's voices heard - to get us out of Europe for the good of our democracy, for the sake of our country."
Speaking before the event, Ms Rees-Mogg, who lives in Lincolnshire, said: "I will be standing in the East Midlands, where I live with my family, and fighting to represent the people of the East Midlands - all of the counties - in order to ensure the Brexit they voted for is actually delivered.
"I think our politics is broken. It's been very clear that we have got a Remainer parliament trying very ineffectually to represent the Leave vote. We need Leave representatives to fight the corner of our democracy."
Asked why Labour and Tory Brexiteers should switch their allegiance to the newly-formed party, she replied: "When it comes to Labour, Lord Adonis has said it better than I could - if you supported Brexit, don't vote Labour.
"For the Conservatives, they are in such a confused place. There is no leadership from the top. Theresa May has succumbed to the Remainer will of some of her party and ignored the rest of her party.
"If you want your voice to be heard, vote for the Brexit Party."
Ms Rees-Mogg said it had yet to be confirmed where she would be ranked on the Brexit Party's list of candidates in the East Midlands.
"Obviously I hope to be reasonably high up and I hope we get as many votes as possible so that there as many representatives in order to make sure we're heard."
During a speech at the rally, party leader Nigel Farage drew laughter as he said he had spent two decades in the European Parliament and had "enjoyed it more than they have".
Telling party supporters he is not a career politician, Mr Farage said: "I genuinely thought after 498 MPs voted for Article 50 that we would leave the European Union on March the 29th.
"I genuinely thought that I had played my part in turning around history and the future of our country. I was perfectly happy to cease involvement in frontline politics."
Mr Farage added: "I am not, after 25 years of fighting and campaigning for our country to be free and independent, I am not prepared to stand aside - I am not prepared to be rolled over by our career politicians."
He also said that it was clear that Parliament did not represent the will of the people.
"I think it's obvious that our two-party system simply doesn't work any more. I think it's obvious that our two big parties serve nothing but their own interests."