The 47-year-old has two daughters, Seraphina, 10, and Violet, 13, alongside a seven-year-old son, Samuel - all of whom she shares with former husband Ben Affleck.
Though it's not the first time Garner has resonated with parents across the globe, as she shared a meme summing up the bittersweet emotions that come with dropping your kids off for another school year back in September.
"It was time, Lord, yes," she wrote. "But why does the house feel so empty?"
Although she regularly shares relatable content on Instagram, the silver screen star is careful to shield her kids' private lives from the spotlight.
"It's so gnarly to be a kid now," Garner told US InStyle. "I guard my kids' privacy as much as I possibly can, and I’ve never posted pictures of them on Instagram. I used to refuse to say their names during interviews - but everyone knows their names! I would just say 'my eldest', which I still do out of habit a lot."
"I'm sure there are times my kids would really love to see themselves reflected on my social media in a fun way and to have the attention they would get from that. But I've fought too hard against it. It would feel hypocritical," she continued.
"There's no implied judgment of people who do put their kids up there; I just don't think most kids have been hounded in the way that mine were when they were little."