Most of us know someone who grew up with siblings, or perhaps that person is you.
There is a healthy competitive nature between siblings that motivates them to excel in many different areas of life like in school or social standing. But there is no better stage for this display of sibling competition than in the field of athletics.
For most of us, this rivalry likely started and ended in youth athletics, perhaps even as teammates, and served as a source of camaraderie. But for four American households, four American families, four sets of siblings...this relationship continues today and will be on full display for the world to witness come February, 9 2018.
That's when the 2018 Winter Olympic Games in Pyeongchang, South Korea are set to open.
Here's a quick look at the four sets of siblings who are hoping to make some noise for themselves and each other in Pyeongchang.
The quest for gold in South Korea is a lofty goal, and one that can be as elusive as it is coveted.
Just ask Monique Lamoureux-Morando or her twin sister Jocelyne Lamoureux-Davidson, who were 3 1/2 minutes away from winning their first Olympic goal medal over rival Team Canada back in the 2014 Sochi games.
But when Team Canada tied and eventually came back to win the gold in overtime that followed another silver medal finish in Vancouver in 2010, it left a thirst for gold that still has not been quenched. But Pyeongchang offers them a rare opportunity, a third shot at Olympic glory in women's ice hockey.
For another set of siblings, winning any sort of medal would be a first. The brother-sister duo of Alex and Maia Shibutani will be making their second appearance in the Winter Games.
Alex, 26, and sister Maia ,23, made their Winter Olympic debut in 2014 in Sochi where they finished ninth in ice dancing.
Since then, they have worked hard to perfect their craft, climbing the ranks in competition along the way, and finished with a bronze medal in the 2017/2018 ISU Grand Prix Final, a competition featuring some of their main opponents in Pyeongchang.
Sadie and Erik Bjornsen are the cross-country skiing brother and sister combo who will compete for Team USA in the women's and men's divisions respectively.
It will be their second appearance at the Winter Games for both of them, however neither podiumed in Sochi.
Sadie, 28, had a very successful world cup season, with a silver medal finish in the women's individual sprint and a bronze medal finish in the team sprint. The former was her own personal best individual finish.
Meanwhile, her younger brother Erik, 26, will look to make his first Olympic podium of his own after finishing 6th in the team sprint classic, 11th in the 4x10K, 38th in the 15K classic and 42th in the 30K skiathlon back in 2014 in Sochi.
Olympic curling will have a new look to it in Pyeongchang, after the new mixed-doubles event was added to the docket of competition.
The new event that features only two teammates, one male and one female, instead of the tradition version which features four same-sex teammates.
It will afford Becca, 27, and her older brother Matt, 28, the opportunity to compete as teammates.
The two have high aspirations for South Korea, having won the 2017 mixed-doubles curling championship, as well as finishing first in the Olympic trials.
Both Becca and Matt will be making their Olympic debut in Pyeongchang, but it won't just be as teammates. They'll both also compete in the traditional form of curling, with Becca on the US women's team and Matt on the US men's team, respectively.
No one can know how things will play out for these siblings, who have overcome the ultimate odds of not only qualifying to make an Olympic roster, but to do so together. But as the games approach, their sights will shift from simply qualifying, to making some noise on the world stage.
From young children, to young adults, these athletes have solidified a bond with their siblings that are sure to make their parents, and hopefully, their country proud.