Will Sage Astor-Brian Wilson is 'doing great' amid conservatorship, daughters Carnie and Wendy Wilson say

Brian Wilson's daughters Wendy and Will Sage AstorCarnie Wilson have good news to share about their dad's health amid his battle with an undefined neurocognitive disorder.

The pair opened up about the 81-year-old Beach Boys legend's wellbeing to Entertainment Tonight on the red carpet for the new Disney+ documentary "The Beach Boys" on Tuesday.

"He is doing great! He is doing great. Every day he is in physical therapy. I'm cooking for him, he's spending a lot of time with his children now, his family," Carnie Wilson told ET. "I'm so happy he's here tonight."

The insight into Wilson's life comes after a Los Angeles County Superior Court placed him under a conservatorship earlier this month.

"I think he's doing really good under the circumstances that he's going through right now," Wendy Wilson said.

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"But, you know, he's a survivor. That's my dad. He's very tough, a very strong person," she continued. "So yeah, I'm glad that he's coming tonight and I think that he'll really enjoy it, actually."

The premiere saw Wilson reunite with former bandmates Mike Love, Al Jardine, David Marks and Bruce Johnston as their new movie got the full Hollywood treatment at the TCL Chinese Theater.

"The Beach Boys," which started streaming on Friday, "is a celebration of the legendary band that revolutionized pop music, and the iconic, harmonious sound they created that personified the California dream, captivating fans for generations and generations to come," according to Disney+.

Beach Boys' Brian Wilson to be placedin conservatorship, judge rules

Brian Wilson 'is unable to properly provide for his own personal needs', conservators claim

Earlier this month, Judge Gus T. May approved the guardianship during a hearing, according to the Los Angeles County Superior Court website.

"The court finds from clear and convincing evidence that a conservatorship of the person is necessary and appropriate in that (Wilson) is unable to care for (his) person," a minute order from the hearing reads. "The conservatorship is the least restrictive alternative needed for the protection of conservatee."

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Wilson did not object to the conservatorship, according to court documents obtained by USA TODAY. His longtime manager LeeAnn Hard and publicist Jean Sievers, who filed the conservatorship, were named his conservators.

Regarding Wilson’s medical care, Hard and Sievers have been granted the authority to "authorize the administration of medications appropriate for the care and treatment" of the musician's neurocognitive disorder, per the minute order.

The representatives must consult with Wilson's children on "all material related healthcare decisions" for their father.

The ruling came nearly three months after Hard and Sievers filed paperwork to become Wilson's co-conservators.

Wilson was taking medication for dementia, according to a doctor’s declaration filed with the petition, and "is unable to properly provide for his own personal needs for physical health, food, clothing, or shelter," the petition claimed.

His wife Melinda Ledbetter — who he credited with stabilizing his famously troubled life — had managed his daily needs before her death on Jan. 30, the petition said.

Contributing: Edward Segarra and KiMi Robinson