To commemorate National Middle Child Day on Sunday Aug. 12, Jennifer Garner, 46, took to Instagram to share a sweet throwback pic of herself and her two sisters on a sailboat. And in the adorable snap’s caption, Jennifer gushed about all the qualities she inherited from having both an older and younger sibling. 

“Attention seeker. ?✅Melodramatic. ?✅Peacekeeper. ??✅Middle sister, now and forever.???‍♀️?#NationalMiddleChildDay #IHaveTheBestSisters #LaughingGull2 ⛵️ #GarnerGirlsWereNeutrogenaGirls. Also, #ILoveMyMiddleChild ❤️❤️❤️,” the mom-of-three captioned the pic. 

Jennifer grew up with her two sisters, Melissa Lynn Garner, 49, and Susannah Kay Garner, 43, in West Virginia. Earlier this year on National Siblings Day (which fell on Tuesday, April 10), the actress similarly mentioned just how important Melissa and Susannah are in her life with a sweet photo collage posted to Instagram. 

“First and foremost, always and forever, I am the middle Garner Girl. How lucky am I to have such sisters. #NationalSiblingsDay #MiddleSister #MelissaandSusannah #ILoveMySisters,” she wrote in the caption.

In a 2009 interview with The Independent, Jennifer also credited her older sister, Melissa, for all of her showbiz success. “If I’m totally honest, I wouldn’t be where I am today if it wasn’t for the fact that I have this bigger-than-life, incredible older sister,” she shared. 

“She’s beautiful, and she was valedictorian, got a 1600 on her SATs and was the head majorette,” Jennifer continued. “I was just the middle kid, kind of looking for attention. So that’s what drove me, I think, to do things she wasn’t doing.”  The Love, Simon actress now has three kids herself with her ex-husband Ben Affleck

Almost four years after Jennifer and Ben announced their separation, Us Weekly recently reported that the couple is allegedly in a good place today. “Jen’s always been very optimistic and has a glass half-full attitude even during the roughest of times,” an insider revealed. “She’s always taking the kids different places and looking for fun things to do with them.”