John Stamosis fully embracing his role as a bonus Jonas.

TheFuller Housestar has been involved in ahilarious prank warwithNick Jonasfor months now, but it seems the two have finally set aside their differences – and Stamos appears to have joined the family!

Stamos, 55, posed withJoe, 29, Nick, andKevinat theWango Tango concertSaturday in aJonas BrothersT-shirt, calling himself as “Uncle Jonas.”

In the photo, he stands between Kevin, 31, and Nick, 26, with a finger to his lips as he shows off apparent tattoos of all three brothers on his arm.

The actor – who is best known as Uncle Jesse onFull House– later posted a video that featured him zooming into the Brothers’ drum set with the caption, “Guess where I am.”

Stamos introduced the band before their Wango Tango performance, telling the crowd, “You know, people often say to me, ‘John, you stay so young, you like all the hip music, you’re so damn cool — how can I bring that kind of vibe into my own life?’ And I tell them it’s simple: Get yourself a Jonas Brothers T-shirt.”

In addition to firing off multiple T-shirt cannons, the father of one said, “And because I look so damn good in it, the guys made me an honorary member of the band. Last night during a private ceremony, I was knighted into the band as Uncle Jonas.”

Stamos has long been a fan of the “Sucker” singers, and has been spotted in recent years sporting Jonas Brothers T-shirts.

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Nick took notice, and in February kicked off the prank war when he was photographed wearing a sweatshirt that had a photo on it of Stamos wearing a JoBros T-shirt.

“It’s your move @johnstamos,” he wrote, sharing the photo on Instagram.

John Stamos/Instagram

https://www.instagram.com/p/Burp5r5BaOo/John Stamos/Instagram

Jonas again escalated the war, making a large blanket out of the photo of Stamos sleeping on his pillow.

Nick Jonas/Instagram

https://www.instagram.com/p/Bu4_Uq-F_d4/Nick Jonas/Instagram

“#jobrosforlife,” he captioned an Instagram photo of his tattoo artist getting to work.

Stamos evengot Joe in on the fun, when he chimed into a post the star shared to Instagram asking fans which songs they’d most like to see the group perform on their upcoming tour.

The Jonas Brothers performed at Wango Tango Saturday, along with stars like Halsey,Taylor Swift, Zedd and Five Seconds of Summer.

source: people.com