Jamie Spears has been his daughter's legal conservator for 12 years, due to concerns around her mental health.
He temporarily stepped aside from the role overseeing her personal affairs in 2019, citing his own health problems.
Some of Spears' fans believe she was forced into the arrangement, and have been running a #FreeBritney campaign.
What has Britney now said?
"Britney is strongly opposed to James' return as conservator of her person," according to a court document filed to the Superior Court of California in Los Angeles.
It explained that the singer was in favour of the role, which she said "rescued her from a collapse, exploitation by predatory individuals and financial ruin" and made her "able to regain her position as a world class entertainer".
However, she wants her manager Jodi Montgomery, who stepped in for her father during his absence, to become his permanent replacement, once the conservatorship is up for extension again after 22 August.
Her lawyer said he expected that James Spears would contest the request to push him aside.
The document also revealed that Britney has no plans to perform again soon. She last performed live in October 2018, before cancelling a planned 2019 Las Vegas residency due to her father's ill health, noting how "it's important to always put your family first".
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