“Duck Dynasty” star Phil Robertson is not doing well amid his battle with Alzheimer’s … and his son Jase says there’s no reason to sugarcoat the topic.

Here’s the deal … late last year, Jase made the sad announcement that Phil had Alzheimer’s … and the 78-year-old’s condition was rough. Since then, he’s asked daily about his dad by fans.

“The No. 1 question I get everywhere I go: ‘How’s your dad doing?’” Jase said on the April 2 episode of the “Unashamed with the Robertson Family” podcast. “Now, I’m just giving the blunt truth: I say, ‘Not good.’”

It was announced back in January that the show would be coming back after nearly 8 years, following Willie and Korie Robertson and their now adult children.

7:25 AM PT — Joseph McBride, lawyer for the Tate brothers, is blasting the investigation … telling TMZ it’s a “pathetic delay tactics by a group of weak lawyers running from a fight in the Florida Defamation Case, because they know the evidence is overwhelmingly on our side.”

He adds … “The SDNY is subject to Washington. Washington is not involved. We are not worried. Nothing changes. Our march to victory continues.”

The Tate brothers’ legal issues in the U.S. are piling up — federal prosecutors are now investigating them … according to an attorney involved in a civil suit with them.

Here’s the deal … Andrew and his brother Tristan filed a $5 million defamation lawsuit against an unidentified woman and 3 other people last year in Palm Beach County, FL — claiming the defandants’ allegations prompted the Romanian officials to criminally charge the Tate bros.

Well, an attorney representing one of the defendants filed legal docs requesting certain information in that defamation case be kept confidential due to an ongoing U.S. Attorney’s Office investigation.

In the docs, obtained by TMZ, Danielle Pinter says the document should not be released publicly until the “United States federal investigation and/or prosecution by the Department of Justice for the Southern District of New York of Andrew and Tristan Tate has concluded.”

We’ve reached out to the SDNY for any info on the alleged probe. Ditto for the Tate brothers’ rep.

As we reported … Andrew is dealing with 2 other investigations in the U.S. — one in Florida and another in Beverly Hills. Tristan is also being looked at in the Florida probe in which Governor DeSantis announced the brothers were not welcome in the state.

TMZ broke the story … Andrew’s ex-girlfriend, Bri Stern, filed a report with police, accusing him of sexually assaulting her last month in the Beverly Hills Hotel. She has also filed a lawsuit against him.

The Tate brothers are also facing human trafficking charges in Romania, and recently returned to that country for a court date in that case. They have not yet been convicted, or found liable, in any of the legal matters they’re facing.

Mariah Carey made an unexpected appearance on her son’s Twitch live stream … and the poor kid was mortified in the hilarious moment!

The 13-year-old Moroccan, AKA “Rocky,” was chopping it up with his fans on Twitch … when his sister Monroe showed up in the background — followed by his superstar mom.

Needless to say, everyone on his stream went nuts when they saw Mariah … with several asking “Ms. Carey” to stick around and hang.

For those unaware, Rocky and Monroe are the twins Mariah shares with Nick Cannon — part of Nick’s LARGE family tree.

Odds are Rocky will lock the door next time before he is ready to game on!