On Twitter, Britney responded that she and Jamie Lynn rarely spent time together "15 years ago" – the era in which Spears was experiencing a very public period of mental ill health – and said : “ So why are they even talking about that unless she wants to sell a book at my expense ? ” Jamie Lynn was also asked why Britney had objected to her sister performing a remix of her songs at the 2017 Radio Disney Awards, which Britney said in July "hurt me deeply".

Speaking to Good Morning America in an interview to promote her forthcoming memoir, Jamie Lynn Spears alleged that Britney once locked them both in a room while holding a knife.

She also claimed that her sister had screamed in her face during the Covid-19 lockdown, and described her behaviour over the years as "erratic, paranoid and spiralling".

' I was doing a tribute to honor my sister and all the amazing things that I 've done.

i have cleared up with the fact that i don't think she's personally upset with me about that.

Truthfully, I don ’ t know why that bothers her. ” Britney responded : "It may sound like a silly thing to most people, but I wrote a lot of my songs and my sister was the baby.

she never had to work for anything.

Saving the day: Britney returned to Twitter to report that her fiance Sam Asghari, 27, had gone out and purchased her some pain medicine for her fever

Everything was always given to her !"

She claimed that Jamie Lynn said the performance wasn't her idea.

In a subsequent statement posted to Instagram, Jamie Lynn questioned the veracity of Britney's remarks.

"It ’ s become exhausting when conversations and texts we have in private don ’ t match what you post on social media," she wrote to her sister.

Saviour: Minutes later, Britney returned to Twitter to report that her fiance Sam Asghari, 27, had gone out and purchased her some pain medicine for her fever

“ I know you ’ re going through a lot and I never want to diminish that, but I also can ’ t diminish myself. ” She said it was hard to "rationalise to my oldest daughter why our family continues to get death threats, as a result of their aunt's vague and accusatory posts, especially when we know she could tell the truth, and put an end to all of it in one second if she wanted to".

She went on : "Sadly, after a lifetime of staying silent, I have come to realise this isn't going to be a reality, and I may have to set the record straight myself in order to protect mine and my family ’ s wellbeing."

She denied that her book was all about Britney and that she had ridden her sister's coattails to fame.

That being said, I hate to burst my sister's bubble, but my book is not about her ...' I can't help that I was born a Spears too, and that some of my experiences involve my sister.

Questioning: Juju Chang, on Wednesday's Nightline, asked why Jamie Lynn was speaking out about her sister

I ’ ve worked hard since before I was even a teenager, and I ’ ve built my career in spite of just being someone ’ s little sister."

Jamie Lynn said she was "speaking my truth" to “ put an end to the unhealthy chaos that has controlled my life for so long ”.

the media, this business has always been extremely hateful" to her.

“ I 've given enough … MORE than enough … I was never given back what I want. ” In November, Britney Spears successfully terminated the conservatorship that governed her life and career for nearly 14 years.

She said soon after that she believed her family "should all be in jail" for the “ demoralising and degrading ” treatment she experienced under the arrangement.

Jamie Lynn has made few public comments on the conservatorship and her role in its management is unclear.

Posting on Instagram in June, she said : "Maybe I didn't support [ Britney the way ] the public would like me to with the hashtag on a public platform, but I can assure you that I supported my sister long before there was a hashtag, and I ’ ll support her long after".

Jamie Lynn's memoir, Things I Should Have Said, is published on 18 January by Hachette ’ s Christian imprint, Worthy Books.

In October, the US mental health charity This Is My Brave declined her offer to donate a portion of the book ’ s proceeds.

I'm not even joking … My body had chill bumps everywhere, like I was freezing yet my body was extremely hot and I couldn't move.

In the GMA chat, Juju asked Jamie Lynn to explain the drama around her tribute to Britney at the 2017 Radio Disney Music Awards where she performed a medley of the singer's biggest hits.

So yes, they did ruin my dreams. '

Stomaching it: Britney noted that she was sick with a '104 degree fever' and that it was the only reason she could 'surrender to not caring' about her sister's claims about their relationship and her 'crazy' behavior

[ My parents ] told me I can't upset Britney.

I close my eyes for 20 minutes and then that's on repeat. '

It's hard to see these posts, as I know the world also feels.

I just wish her well.

There ’ s no better example of that than Good Morning America ’ s decision to interview Jamie Lynn Spears ’ – Britney ’ s younger sister – about her new book and – presumably – the entire conservatorship debacle.

But I ’ m glad she ’ s done it anyway.

The shocking detail was revealed during a conversation with Juju Chang on Wednesday's Nightline, where Jamie Lynn, 30, was asked why she included it in her memoir.

When I tried to remove myself from the situation, that's when I guess she got really angry and my oldest daughter tried to mediate the situation.

Tell-all: Jamie Lynn Spears claims her sister Britney Spears 'locked them both in a room with a KNIFE' in her new memoir, Things I Should Have Said, which she promoted on Nightline

' I don't like that my sister showed up at an awards show and performed my songs to remixes ! '

Concluding the interview, Jamie Lynn said :' I love my sister.

Jamie went to rehab in 2004 after Britney reportedly urged her father to seek help.

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