Michael Phelps and Allison Schmitt have the most adorable, respectable friendship

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Michael Phelps often refers to fellow Olympic gold medalist Allison Schmitt as his sister.

Between calling her "Aunt Schmitty" to his son, happily "third-wheeling" with Phelps and his fiancé and professionally carpool karaoke-ing, one thing remains constant – Schmitt's longtime, admirable friendship with the 23-time gold medalist.

After training together for more than 12 years, the two swimming stars have developed a rare relationship – one that's open to feedback and frustration, but definitely more fun.

READ MORE: Everything you need to know about the Rio Olympics in one place

"Allison's like my little sister and I love her to death," Phelps said in an interview with NBC. "We're in this together. We're both going through the same thing, and we're supportive through it all."

"I try to help her as much as I can through anything she's going through," Phelps said, as Schmitt interrupted.

"He's seen a lot of tears," she said.

"I've seen a lot of tears, but I've seen a lot of smiles. A lot more smiles than tears."

2016 U.S. Olympic Swimming Team Training Camp Media DayPhoto: Getty

Both athletes have faced their fair share of frustrations throughout their careers. Those are inevitable – but they said that having each other through it all makes it a better transition back to the top.

"I look up to him so much," Schmitt said. "Anything he says to me, whether it's outside the pool or inside the pool, I take that advice to heart.

READ MORE: Michael Phelps is no longer throwing back 12,000 calories of pizza and Red Bull a day

Phelps echoed those sentiments.

"I wouldn't be here where I am today without having her every day."

Check out their friendship as told through both of their social media accounts:

The adorable friendship of Michael Phelps and Allison Schmitt
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The adorable friendship of Michael Phelps and Allison Schmitt
@m_phelps00: @arschmitty and I just crushing it on set today!! #mpswim #sanantonio #sanantonio #200flyfinaltonight #nbcsports
@m_phelps00: Thanks @arschmitty for my cupping today!!! #mpswim #mp πŸ“· @chasekalisz
@arschmitty: Last night featured @m_phelps00 winning his 23rd gold medal and 28th Olympic medal...surpassing HIMSELF as greatest Olympian of all time. Cannot express how proud I am especially after watching him overcome so much in the past few years and now being a father and soon to be husband to the lovely @nicole.m.johnson!!! You deserve every thing you've accomplished and I'm so excited to see you excel in your next chapter of life! Love you!!
@arschmitty: Sending @m_phelps00 off to "light up" the opening ceremonies as THE UNITED STATES OF AMERICA FLAG BEARER πŸ‡ΊπŸ‡Έ #illuminatedjacket
@m_phelps00: Happy bday @arschmitty !!! To my sister from another mother!! Hope you have the best bday ever!!!
@arschmitty: First ice bath as a 31 year old?!?! HAPPY BIRTHDAY TO THIS CRAZY!!! Excited to watch this guy continue to dominate in Omaha and then bring the heat in RIO!!!!!! Can't believe we get to do it again!!!! πŸŽ‰πŸŠπŸ’―πŸ’› #dieahappyman #recordyear #carkareoke
@m_phelps00: The normal Sunday family swim!! #babyp #mpswim @nicole.m.johnson @arschmitty
@arschmitty: A weekend well spent brings a week of content πŸ˜πŸ™Œβ˜€οΈπŸ‘ΆπŸΌπŸ˜˜πŸ‘Ό ...usually I'm the one that can't make it thru a movie/show 😴 but this happy family took the prize this Saturday!!! So happy I finally got to meet @nicole.m.johnson and @m_phelps00 precious miracle!!! 😍😍 Their little guy melted my heart and there's nothing little about the light that you already bring to the world, Boomer...Life is gonna be so fun!!! πŸ’›
@m_phelps00: What better way to spend #olympicday than at the Olympic training centerπŸ˜πŸ‘πŸ‘ @arschmitty photo/muscle cred @kkrirsh
@arschmitty: In case you were having the Monday blues, these gems should give you a good laugh! Back when Boomer was the size of a blueberry in his mommy's tummy and Hacky was kinda American πŸ€—πŸ‘ΆπŸΌβ€οΈπŸŽ‰πŸ˜˜πŸŽ‚πŸ‘΄πŸ½πŸ˜ CONGRATS to the new parents @nicole.m.johnson and @m_phelps00 and HAPPY BIRTHDAY to my favorite Aussie @grant__hackett !!
@m_phelps00: Nice workout session today... @arschmitty and I got a new swimmer for Sunday's!! Welcome @nicole.m.johnson !
@arschmitty: Can't wait to kick it with baby PπŸ‘’πŸΌπŸ’™πŸ€— #2monthstogo #hopesofageminibaby #auntieschmitty
@m_phelps00: @arschmitty nice little sunset on the beach
@arschmitty: Happy anniversary to my unbiological ma and pa πŸ’‘, the couple that always welcomes me as a third wheelπŸ‘¨‍πŸ‘©‍πŸ‘§, and the best of friends that sometimes know me better than I know myself πŸ™ŠπŸ€—πŸ˜‚πŸ˜˜ looking forward to everything this year brings you two!!! Can't wait to meet baby p and stand by your side as you exchange vows πŸ‘ΆπŸ»πŸ’πŸŠπŸΌπŸ‡ΊπŸ‡Έ
@arschmitty: Why blend in when you were born to stand out?! πŸ’―πŸ˜œπŸ˜˜ #somuchloveforthesetwo #redcarpet
@arschmitty: Olaf working hard ⛄️ & Michael hardly working πŸ‘» #happyhalloween
@arschmitty: CAN NOT BE MORE EXCITED FOR THE SOON TO BE MR & MRS PHELPS πŸ˜β€πŸ’οΈπŸŽ‰πŸ‘°πŸ’πŸŽΆ #beautifullove #itsreal #truelove #congrats @m_phelps00 @nicole.m.johnson
@arschmitty: Timehop currently has some great #tbt and to continue my #thankfulthursday thankful for friends like this πŸŽ‰πŸ˜œβ€οΈπŸ‘ŠβœŒοΈ

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