"My babies are no longer babies anymore" Geary wrote
"First day of kindergarten for Mia, TK for Lola and preschool for Luca! My babies are no longer babies anymore 😭," Geary, 28, captioned the post.
Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.
The Grammy-nominated artist also shared a sweet clip of smiling Geary, dressed in all black, holding son Luca's hand as she walked him into school. The youngest of the family had his hand in his pocket as he prepared for his first big day.
“The goods!!! ❤️🙏😎,” Thicke captioned the photo.
Fatherhood "brought me back," Thicke said. "I think probably when I lost my father, it's no coincidence that I've had three children in the last few years … because that's how big that hole is."
"I remember a friend of his and mine said, 'A big tree has fallen.' That's what my dad was. He was the big tree," he added.
"Now here I am, this medium-size tree, and I've got to grow my branches and I've got to secure my roots and I've got to protect everybody that he was protecting also," Thicke continued. "For me, it's a job that I'm very happy to do, and every day I try to make him proud of me."
For more People news, make sure to sign up for our newsletter!
Read the original article on People.