John Stamos reacts to Dave Coulier’s cancer diagnosis

The “Full House” cast will always be family.

John Stamos showed love to his “brother” Dave Coulier on Instagram Wednesday after Coulier, 65, announced he has been diagnosed with stage 3 cancer.

Stamos, 61, posted a tribute with various photos of the couple over the years, as well as an emotional message to his longtime friend.

“My brother from day 1. Love you @dcoulier and I’ll be by your side through it all,” Stamos wrote in his caption.

Stamos and Coulier met as Uncle Jesse and Uncle Joey, respectively, on “Full House,” which aired from 1987 to 1995.

The photos Stamos shared were a mix of old and new snapshots of the duo. In a cute shot, Stamos wrapped his arms around Coulier as they lay in bed together.

In another photo, Stamos and Coulier posed with their late co-star Bob Saget, who died at the age of 65 in January 2022. Saget’s death was ruled an accident caused by blunt force trauma to the head.

Coulier’s wife, Melissa Bring Coulier, responded to Stamos’ heartfelt post in the comments section.

“Love you PP – thanks for the daily support and love!! ,” she wrote.

Fans also reacted to Stamos sweetly highlighting his friendship with Coulier amid the latter star’s health battle.

“Such beautiful pictures. My thoughts and prayers go out to you all as ‘Joey’ heals,” one fan wrote.

Another said: “These relationships that start at work and end up being LIFELONG friendships are extremely rare…and quite beautiful! Love the brotherhood between you guys.”

“He has a great support team and Bob is looking after him! He’s got this,” said a third fan.

Coulier announced Wednesday that he was diagnosed with stage 3 non-Hodgkin lymphoma five weeks ago.

“(I) felt like I got punched in the gut because it never happens to you. You always hear about it happening to someone else,” Coulier said in an interview with Today.

The actor confirmed that he started chemo two weeks after his diagnosis. He also revealed that he shaved his head as a “preemptive strike” amid his cancer battle.

Coulier opened up more about his diagnosis while wearing a hat “Full House Rewind” podcast.

“I started the podcast wearing a hat and I said, I’ve always been a man of many hats, but this hat has special meaning because a few weeks ago I was diagnosed with non-Hodgkin’s lymphoma,” he said in an interview with People.

“It was really a conscious decision that I’m going to face this head on and I want people to know that this is my life,” he continued. “I don’t want to try to hide anything. I’d rather talk about it and open up the discussion and inspire people.”

Coulier also confirmed to People that he told his “Full House” castmates — including Stamos, Jodie Sweetin, Lori Loughlin, Candace Cameron Bure and Andrea Barber — about his diagnosis.

“I didn’t want them to hear it from someone else, so I sent out a text,” he said, noting that he got an “instant” response from everyone who showed him “overwhelming” support.

Two months before announcing his diagnosis, Coulier told The Post exclusively that he would love to do another “Full House” reunion project.

“I’d love to do that. I’m the one pushing the ball up the hill right now to do it,” he shared. “So I’d love to reunite with everybody and do a little bit of a different show. Maybe a kind of flashback show where today we’re navigating our way through adulthood and we flashback to episodes of the original show that give us guidance.”