All About John Stamos' Son Billy Stamos

John Stamos always wanted to be a father.

After playing a doting uncle on the hit sitcom Full House in the late '80s and '90s, John became a dad at age 54 when his son, William “Billy” Christopher Stamos, was born in 2018. He shares Billy, 6, with his wife, Caitlin McHugh Stamos.

Two months before their wedding in February 2018, John and Caitlin announced their pregnancy exclusively to PEOPLE. “I’ll be a fun dad. I’ve been practicing for a long time,” he said, joking, “I’ve done every schtick you can do with a baby on TV … all the bits and jokes and diaper gags. I’ll probably just do all that stuff.”

While John always wanted to have children, he didn't think he’d “meet the right person,” that is until Caitlin came into his life. “I guess I was waiting for the perfect wife, which I have,” the Secrets of Eden star later told Ryan Seacrest.

John also knew his wife would be a "good mother," telling PEOPLE in 2023, "This is a lot for me to say. She is as good as my mother was. I mean, when I watch her, the patience, the kindness she has for him, it's so beautiful."

Here's everything to know about John Stamos' son, Billy.

He was born in 2018

Billy was born on April 10, 2018, in Los Angeles. Stamos announced the arrival of his first child with a photo of Billy resting on his chest. “From now on, the best part of me will always be my wife and my son,” John wrote alongside the sweet image.

Following his son’s birth, John revealed on On Air with Ryan Seacrest that Caitlin delivered Billy in “about 20 minutes.” He said, “It was weird. It was super fast."

The Big Shot actor went on to joke, “A little baby came out and he looked just like [late comedian and close friend] Don Rickles.”

He was named after John’s dad

Billy is named after his paternal grandfather, Bill Stamos, who died in 1998. While announcing the birth of his son, John noted that Billy was “named after my father.”

Prior to welcoming his son, the TV star shared a photo of his late father, writing, “I will certainly fall short of the father my pop was, but — I’m going to give it my all!"

John joked about Billy's first words

At a red carpet event for The Little Mermaid Live in 2019, John joked that Billy’s first two words were “trust fund.” 

“He has a good sense of humor,” the actor said of his son. “That’s the milestone I like.”

At the same event, John told Entertainment Tonight that Billy was talking. “He says Coco a lot,” John shared. “He wakes up in the mornings saying ‘Coco’ and then he says — Lilo is his dog — ‘Lilo, Lilo, Coco, Coco, mama, mama.' ”

He’s a Disney kid

John and Caitlin’s son has inherited their love for Disney. The pair, who got engaged at Disneyland, took their then-7-month-old son to Walt Disney World for the first time in 2018 because John was hosting the Candle Light Procession at Epcot.

In June 2021, the actor told PEOPLE that Billy is "definitely a Disney kid," adding, "it's wonderful to see Billy get excited about stuff now."

Apart from visiting Disney parks and sailing on the Disney Wish, Billy also appreciates Disney films. "His first movie he loved that he watched was Coco. [He watched it] before he could barely talk,” John recalled. “He was like 'Coco, Coco.' He loves Coco, he loves Moana. He loves those animated [films]."

John was emotional over Billy’s first day of school

Billy attended his first day of school in September 2021. John marked the milestone with a video featuring photos of Billy from over the years set to The Beach Boys song “When I Grow Up (To Be a Man).”

“First day of school. I’m not crying, you are,” he captioned the post on Instagram.

The actor was emotional again in 2022 when Billy started a new school. “One of us is starting his first day at school. And the other is doing everything in his power not to cry,” John wrote on Instagram.

He’s joined his dad on stage

Dating back to his Full House days, John has performed with The Beach Boys on several occasions — and Billy, who has shown an interest in music, has joined him on stage twice.

In July 2024, the father-son duo tag-teamed the drums while performing "Good Vibrations" alongside the legendary rock band.

John previously expressed his desire for Billy to get into music. He admitted to Entertainment Tonight in 2021, “Well, as much as I try to steer him towards the music room, he loves to go outside and throw balls and hit things.”

However, after Billy “broke his wrist on the monkey bars” in 2022, John jokingly told E! News that they were “trying to keep him away from sports.”

He is being taught to be “loving and kind”

John and Caitlin are teaching their son to give back. In October 2022, the actor spoke to E! News about laying “the foundation of being loving and kind” for Billy.

"I think we're pretty good examples, my wife and I,” John said. “The hard thing is he lives a pretty privileged life. [My wife's] great, she takes him down to feed the homeless in Orange County and we take him on stuff like that. We try to show him it's about service and giving back."

A few months earlier, Caitlin shared photos from her and Billy’s visit with families of an Illumination Foundation house. The mother-son duo brought them dinner, gifts and activities. “It’s important to me to not just give listeners of the podcast action to take, but to walk the walk myself,” Caitlin penned on Instagram. “I’m also able to see the direct impact @ifhomeless has and can feel more comfortable asking you to support them too. I also love being able to share all this with my son.”

He is a Full House fan

John credits his late friend and costar Bob Saget for Billy’s obsession with Full House. The month after Saget’s death in January 2022, John shared a video of his son watching the show on TV.

“Billy was never interested in Full House and I was perfectly fine with that. Bob died, now he’s obsessed!” he wrote in the caption.

John added, “I blame Bob. (And nanny, @tayloraldrich).”

He celebrated John's 60th birthday in 2023

Billy was by his dad’s side on his milestone 60th birthday in September 2023. The actor celebrated his big day with a heartwarming video of the two laying together in bed. "Do you know how happy I am that I turned 60, and I have such a wonderful son like you?" John asked Billy, who replied, "So happy."

The then-5-year-old adorably told his dad that he doesn’t look 60. “You look baby,” Billy said. The Full House star also asked his son, "Do you say anything about me in your prayers?" Billy answered, "Of course."

John’s video ended with a montage of family moments set to audio of Gene Wilder from Willy Wonka and the Chocolate Factory saying, "Don't forget what happened to the man who suddenly got everything he always wanted — He lived happily ever after."

Alongside the post, John wrote, “I’m right where I’m supposed to be at 60! Thank you for all the birthday wishes and love. I hope to give back to you what you have given me, a wonderful life.”