Friday, April 10 is National Siblings Day. It was founded by Claudia Evart. She started the Siblings Day Foundation, a non-profit organization to remember her two siblings who died early. April 10 is Evart's late sister's birthday. The day is recognized by 49 states in the United States. "The siblings bonds are life-long relationships usually lasting from cradle to grave," states the Siblings Day Foundation website. "It is usually the longest relationship of a person’s life and typically much longer than a mother’s and father’s relationship."

10 Best Quotes By Celebrity Siblings:

1) Beyonce and Solange Knowles

"I'm very proud of my sister and protective of her. Solange is the one person I will fight for. Don't talk about my sister; don't play with me about my sister. If you do, you'll see another side of me," said Beyonce to Essence. "I admire her, and though she's five years younger than me, I strive to be like her. She's so smart and secure. She's sensitive to people's feelings, but not afraid of what they think."

2) James, Tom, and Dave Franco

“Nobody’s going to cast me because I’m James Franco’s little brother. Obviously I respect him and I love him, and we get along very well, but I do want to have my own career," said Dave to Blackbook Magazine. "I know how different we are, and that I can personally play roles that he wouldn’t necessarily want to play. I don’t want to be linked to him for the rest of my life. Every time someone mentions my name, I don’t want James Franco’s little brother to precede it.”

3) Mary-Kate and Ashley Olsen

"She's always there for me when I need her; She's my best friend; she's just my everything," said Ashley.

4) Chris, Liam, and Luke Hemsworth

"One of the biggest inspirations before I started shooting came from my brother, when he texted me and said, "Hey, fatty, it's called 'The Hunger Games', not 'The Eating Games,' said Liam. "So I started working out a lot more and eating a lot less."

5) Kim, Khloe, Kourtney, and Rob Kardashian

"Having lots of siblings is like having built-in best friends," said Kim.

6) Owen, Andrew, and Luke Wilson

"I think there is a middle-child syndrome. I don't know quite what it is, but I think I suffer from it," said Owen.

7) Joe, Nick, and Kevin Jona

"Reuniting with my brothers musically has been really incredible," said Joe.

8) Jake and Maggie Gyllenhaal

"I am inherently a little brother - that's just my nature. It has to do with my sister being very strong and wanting to protect me. It's the natural order of things," said Jake.

9) Jamie, Sydney, Noah, and Graham Sierota

"We’re all super close. We’re there to help each other. Not many teenagers are doing this, so it’s nice to have someone on your team cheering you on,” said Sydney to Observer.

10) Dakota and Elle Fanning

"I like to be very girly, with bows and ruffles on the red carpet. I love pastel colours, especially blue. Me and my sister both because of our eyes look good in blues," said Elle.