The Zac Brown Band's Clay Cook has just expanded his family: He and wife Brooke welcomed their second child, Theron Maine Cook, on Wednesday (Aug. 22).

The new arrival weighed 7 pounds, 12 ounces; and measured 19.75 inches at birth. As Cook aptly noted: "Mama and baby are safe & happy. I'm so lucky in this life."

Mom and dad are not the only happy ones in the family—newly minted older brother Charlie, who was born in November of 2016, seems pretty delighted by the news, as evidenced by the exuberant video his father posted to social media. "When you find out that you're a big brother now," Cook captions the clip.

Cook and his wife announced they were expecting back in January, noting on social media: "So happy to announce that Charlie has a sibling coming this summer! We couldn’t feel more lucky to be growing our family." The couple married back in 2014.

Zac Brown Band is currently on the road; their tour runs through September. In an interview with Billboard earlier this year, fiddle player Jimmy De Martini reveals the band has been recording new songs that might take them in a different direction on their forthcoming album.

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