When you think of the Jonas Brothers, you think of Kevin, Joe, and Nick Jonas, but there's one brother who has always been important to the fandom - Frankie Jonas.

Most recently, the JoBros posted a photo of the brothers for National Siblings Day and this pic may have introduced new fans to Frankie. If you aren't a die-hard Jonatic, you may not know that the band members have a younger brother. Although significantly younger and less famous than his megastar brothers, Frankie has some impressive accomplishments under his belt.

The brothers always say he is the funniest and best brother out of all of them. His Twitter account proves that he really is pretty hilarious. He constantly makes memes out of himself and his celebrity brothers.

After graduating, he moved far away from home, but he is a part of the music industry.

Here are 15 facts you may not know about Frankie Jonas.

15 He Was Too Young To Be In The Band

The sole reason that Frankie Jonas wasn't a part of The Jonas Brothers band is the fact that he was only five years old when they came onto the scene. You can't have a five-year-old going on tour. By the time the band made their comeback last year, they were already established and Frankie had his own life going on.

RELATED: 20 Things The Jonas Brothers Don't Want Fans To Uncover

14 Goes By The Name Mephisto Now

Frankie Jonas has music on SoundCloud, which is posted under the pseudonym, Mephisto. There is no explanation of why he chose that name, but many celebrities take on stage names. Maybe he doesn't want to live in his brothers' shadows, so he doesn't use his famous last name. As Mephisto, he has written songs with Alli Haber. He plans to help lots of artists write and produce music.

13 Is A Teen Choice Award Winner

Many fans remember Frankie Jonas in a guest role on the Disney Channel show, "Jonas LA." In 2009, Jonas won a Teen Choice Award (Choice Breakout TV Star Male) for his appearance on the show. When you win, you get a surfboard. So, he can go surfing with his brothers, who are also Teen Choice winners.

12 Graduated From High School Early

He graduated high school and enrolled in college classes at the age of 16. Jonas told Paper Magazine that he "planned to graduate and move far, far away." After graduating from high school, Jonas enrolled in the Blackbird Academy in Nashville, TN. This is a technical school and it's the place where he studied audio engineering.

11 Has A Degree In Audio Engineering

At only 18 years of age, Jonas obtained a degree in Audio Engineering. Priyanka Chopra Jonas, Joe Jonas, and Frankie's parents showed up to watch him walk across the stage and get his degree certificate. At the grad ceremony, Frankie wore a shirt with a pic of himself on it. He is the first and only Jonas brother to earn a degree.

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10 He Acted When He Was Younger

Along with starring with his brothers in their TV shows and movies, Frankie has acting credits in other roles. He has an uncredited and minor role in Night At The Museum: Battle of The Smithsonian - this film features the Jonas Brothers song, "Fly With Me". The Jonas Brothers also voiced the cupids at the fountain. Jonas has also had other minor roles.

9 Did Voiceover Work

He starred in Ponyo with Noah Cyrus. "Ponyo" is a Japanese animated fantasy film. He voiced the English dub of the character, Sosuke. Cyrus is the younger sister of Miley Cyrus. Frankie's older brother, Nick, was in a relationship with Miley at one point! Frankie also did voice-over work for Spooky Buddies and The Reef 2: High Tide.

8 First Major Role Was In "Camp Rock 2: The Final Jam"

It's crazy to think that Camp Rock 2: The Final Jam aired ten years ago on Disney Channel. Nine-year-old Frankie played one of the Junior Rockers, Trevor, in the film. This meant he got to spend a lot of time with Kevin on the set, as Kevin was in charge of the Junior Rockers. This was Frankie's acting debut.

7 There Is Merch With His Face On It From Back In The Day

Wearing his own merch at his graduation ceremony, Frankie is proud to represent himself. If you do a Google search for 'Frankie Jonas merch,' you will be in luck. Many secondhand sites are still selling the merch that was available during the brothers' tours from 10+ years ago. So, if you were a Frankie fan, you should snatch up some rare merch.

6 He Is A Great And Loving Uncle

Most of his Instagram feed is filled with pictures of Frankie and his family. The ones who make it on there the most are his two adorable nieces, Alena and Valentina. Kevin and Danielle's daughters called him Uncle Dankie and love him very much. We can't wait to see how cute he is when his other brothers have their kids.

RELATED: 20 Little-Known Details About Kevin Jonas' Family Life

5 Used To Be Named The "Bonus Jonas"

Just like any brothers do, Kevin, Nick, and Joe would tease Frankie and call him the "Bonus Jonas," which made for great merch and memorable moments. He was considered forgotten and would constantly tag along with his brothers. That's why they gave him that nickname. Fans started using it, too.

4 Appeared In Paper Magazine

Frankie was in the 2015 issue dubbed, "Celebrity Siblings to Know," alongside Aliana Lohan (sister of Lindsay Lohan), Gemma Styles (sister to Harry Styles), and Madison De La Garza (half-sister of Demi Lovato). In the article, he referred to himself as the 'meme machine' and says he sometimes reads fan fiction about himself when he's bored.

3 He Is A Music Producer

He is (sort of) following along in his brothers' footsteps. Having a degree in audio engineering helps Jonas put together songs for other artists. He currently produces music for up and coming artists. Who knows...he may mix and produce music for his brothers' next album. It would truly be a family affair.

2 Boys Of The Summer Tour

In 2018, Frankie joined the "Boys of the Summer Music Tour," a who's who of Internet Stars. He joined the likes of Dylan Conrique, Caden Conrique, Mackenzie Sol, and others. This year, the annual tour is celebrating its seventh year. While on tour, Frankie will visit18 cities during July and August 2020.

1 Loves Skateboarding And Skiing

His Instagram feed is filled with pictures of him skateboarding and skiing. He has gone skiing many times with his brothers and their wives. The whole family took a vacation in 2018 to Switzerland where they hit the slopes. The 19-year-old also enjoys skateboarding, like any typical teenager.

NEXT: 20 Photos of The Jonas Brothers' Evolution Throughout The Years