Britney Spears' war of words with her family shows no sign of slowing down after accusing them of treating her worse than a death row in-mate.
The singing superstar also declared her father Jamie should be in prison for his behaviour towards her for more than a decade.
Britney's life had been under the control of her legal guardians due to the controversial conservatorship for 13 years.
The legal demand has now been dissolved, the mum-of-two last year regaining authority over her estate.
But she has continued her feud with sister Jamie Lynn since news broke that she is free.
The 40-year-old Toxic hitmaker claimed that her sibling "did nothing" to help her and is "hurt" by previous accusations made by her.
During promotion for her autobiography Things I Should Have Said, Jamie Lynn explained to Nightline that her sister "locked her in a room with a knife" as she exhibited "erratic behaviour".
Britney has retaliated by calling her "scum" on social media - and was back last night with another angry stab at her family.
In a post seemingly first directed at her sister, she said: "I know you have worked hard for the life you have and you have done amazing. But ... what dad did to me, they don't even do that to criminals ... so for you to sit back and act completely aloof to what has happened to me is honestly insane to me.
"It took them years to give me a cup of coffee ... people who have killed people and are in jail or on death row can have as much coffee as they want ... I'm honestly shocked dad isn't in jail!!"
The star then explained that while she loves her sister "unconditionally" but says she is "confused" by where she thinks Jamie's loyalties lie.
Britney - who is mentioned 197 times in Jamie Lynn's 240 page memoir - then directly asks her little sister to refrain from discussing her as she promotes her new book.
She took to Twitter to deny her knife claims over the weekend.
"Jamie Lynn ... congrats babe," she wrote.
"You've stooped to a whole new level of low... I've never been around you ever with a knife or would I ever think to do such!
"The only knife I ever saw you with at home was cutting the biggest piece of squash I ever saw in my life and it was way too big for me to cut."
Jamie took to her Instagram Stories to beg her sister to deal with the feud privately.
She said: "Britney - Just call me, I have attempted many times to speak to you directly and handle this privately like sisters should, but you still choose to do everything on a public platform," she wrote against a grey background.
"In the meantime, please stop continuing the narrative that I haven't been there for you or that I'm making things up."
She continued: "I'm happy to share how many times I've reached out to you, supported you and tried to help you This is embarrassing and has to stop. Love you @britneyspears."
