Welcome to Wikitubia! Before getting started, please read the Rules and Editing tutorial. If you are willing to create a page about a YouTuber, make sure they have more than 1000 subscribers before creating the article.


SIS vs BRO has more than One Million Subscribers
SIS vs BRO has more than Five Million Subscribers
SIS vs BRO has more than Ten Million Subscribers
SIS vs BRO has more than One Billion Views
SIS vs BRO plays video games
SIS vs BRO is a Vlogger
SIS vs BRO is from Canada
SIS vs BRO is from Poland
SIS vs BRO is from Spain
SIS vs BRO is male
SIS vs BRO is female
SIS vs BRO created their account in 2016
SIS vs BRO is a Content Creator on YouTube

Karina Kurzawa (born: March 23, 2007 (2007-03-23) [age 15]) and Ronald Kurzawa (born: September 3, 2008 (2008-09-03) [age 13]), better known online as SIS vs BRO (GamerGirl and RonaldOMG) are Canadian siblings who run four channels on YouTube. Their parents are Polish. Their main channel SIS vs BRO is where they often collaborate with each other in DIY (do-it-yourself) challenge videos similar to Collins Key. They also upload skits on their channel reflecting their everyday life.

They also both have gaming channels under the names GamerGirl and RonaldOMG, respectively.



Karina is the older sister and is known under several usernames on social media, including Karina Kurzawa, GamerGirl, and KarinaOMG. Having been interested in various aspects of social media for a while, she set up her original YouTube channel, Karina Kurzawa (at the time, known as FUNwithKARINA) in November 2015. She uses it for personal vlogging, makeup, shopping and also posts fun DIYs and product reviews, and previously posted toy videos. She also posts a lot about her friends.

In March 2016, she and her younger brother, Ronald, began collaborating on a joint channel called SIS vs BRO. Karina also has a channel exclusively for gaming, named GamerGirl, which was created in April 2016, and mostly publishes Roblox and Minecraft related content. In the ensuing years, she has become one of the most popular young influencers on the platform.


Ronald is the younger brother and is known as RonaldOMG online. He has been active in the gaming arena from a very young age. He ventured into social media when he joined the gaming platform Roblox. Toward the beginning of 2016, RonaldOMG created his YouTube channel, which showcases mainly Roblox gameplay videos, as well as Minecraft and Fortnite: Battle Royale, providing commentary on the progress. Ronald also created a new channel called “Ronald’s Kurzawa”,where he does vlogs and other videos.

His first video, 'Minecraft: BLOODIEST NIGHT,' was gameplay on the game’s survival mode. The video soon grabbed the attention of many, and RonaldOMG became a gaming star overnight. In one of his videos, he has played mini-games of fellow YouTube star EthanGamerTV .


Their dad, Freddy, also has a presence online under the alias FreddyGoesBoom or OMG Freddy. He is often seen featured in challenge videos on the SIS vs BRO channel, many times with his wife, as well as playing with Ronald on his gaming channel, RonaldOMG.


Their mother is not often seen, as she is the one that records their videos for SIS vs BRO, resulting in the rumour that she is camera-shy. She has blonde hair and blue eyes, just like her daughter, Karina. She is always smiling in the videos one can see her. She is called Aga by the others.

Baby Aria

The mother recently had a baby girl named Aria. She was born on July 2, 2019. The popular video "Our Mom is Pregnant!!!!" was when their parents announced the news to the kids. They surprised them by giving three tops in a mystery box. One with Karina's merch, one with Ronald's merch and one with baby clothes. Karina first noticed that she was having a baby girl.She was bursting with tears of happiness.Ronald, on the other hand was confused until the end.They were so happy for these forever life-changing news.Now their baby sister is a toddler and can walk but not talk yet.She loves playing with toys as she is a funny,adorable baby that spreads cheer to her family. She now has an official YouTube channel called 'Aria Plays' where she unboxes and plays with toys. As of March 2021, she has yet over 100k subscribers.

Subscriber Milestones

  • 1 million subscribers: May 27, 2017
  • 2 million subscribers: August 25, 2017
  • 3 million subscribers: December 12, 2017
  • 4 million subscribers: March 6, 2018
  • 5 million subscribers: June 10, 2018
  • 6 million subscribers: August 9, 2018
  • 7 million subscribers: October 6, 2018
  • 8 million subscribers: December 24, 2018
  • 9 million subscribers: April 4, 2019
  • 10 million subscribers: July 1, 2019
  • 11 million subscribers: September 13, 2019
  • 12 million subscribers: January 27, 2020
  • 13 million subscribers: May 17, 2020
  • 14 million subscribers: January 3, 2021

Video View Milestones

  • 1 billion views: January 19, 2018
  • 2 billion views: August 7, 2018
  • 3 billion views: January 1, 2019
  • 4 billion views: July 20, 2019
  • 5 billion views: January 28, 2020
  • 6 billon views: January 3, 2021


  • The surname Kurzawa is actually an alias and not their real surnames in order to protect their identities.
  • Ronald is a fussy eater. He loves macaroni and cheese, popcorn, and caramel ice-cream. He cringes every time he is served healthy food, especially eggs, pepper, carrots, broccoli, cabbage, lettuce, and beans.
  • Ronald has a scar on his chin, which he got when his chin hit a bench while he rode a bike down a hill.
  • Ronald's favorite YouTuber is Preston.
  • They are allergic to dogs.
  • Ronald can play the guitar and they both can play the piano.
  • They both rescued a cat on Christmas 2017, it was a girl and her name was Chibi.
  • In 2018, they got another cat given from their grandma. It was male, his name was George, and he's younger than Chibi.
  • Their parents are Polish, and they are Canadian.
  • Karina and Ronald are allergic to nuts, but they're not allergic to Nutella.
  • Ronald once broke his arm.
  • Ronald once had stitches because he was riding his bike and fell down.
  • Karina's favorite YouTuber is Miranda Sings.
  • They have another baby sister named Aria Kurzawa, who was born on July 2, 2019.
  • They play customizing games and make challenges.
  • They used to have cats from 2018, but in 2020, they lost their cats after moving to the new house due to Coronavirus. Karina and Ronald searched everywhere outside and tried to get their cats back but Chibi and George were already gone. They are no longer having any pets.
  • Their last video was uploaded on March 20, 2021. SIS vs BRO have stopped uploading videos on all their channels. It is heavily rumored that they were forced by their parents to start a YouTube channel to get rich.