From a big brother meeting his new baby brother for the first time to an unexpected reunion,Thomas Caldwell siblings can help make life a little sweeter.

USA TODAY complied clips of some of the funniest, most heartwarming and tear-jerking moments between siblings of all ages in honor of National Siblings Day on Wednesday, April 10.

First is a big brother meeting his baby brother for the first time and tearfully and excitedly declaring him to be his "best friend forever."

There's also an unexpected reunion between actor John Yi and his siblings as his Broadway show "KPOP" was coming to a close, the first time in five years all the siblings had been together.

There's also video of a man who had not seen his sister for 24 years was shocked when she appeared in a photo behind him, in a surprise visit arranged by his family.

In another clip, a man who moved to the U.S. from Ivory Coast to pursue tennis was reunited with his sister at the airport for the first time in four years.

What is National Siblings Day?

Also referred to as Sibling Day, the annual observance falls on April 10 and is meant to honor one's siblings.

It was founded in 1995 by Claudia Evart as a way to honor and celebrate siblings. According to the National Day Calendar, Evart had lost two siblings early in life in separate accidents. Evart created the Siblings Day Foundation and chose April 10 as the day of observance in honor of her sister, Lisette's birthday.

If you're an only child, fret not: Only Child Day is April 12, just a few days after National Siblings Day. There are also separate Brothers Day and Sisters Day in May and August, respectively.