October 24, 2013 11:50 AM

Courtesy Zac Hanson

And baby makes five!

Zac Hanson, 28, and his wife Kate, 29, welcomed a baby boy on Thursday, Oct. 17, his rep confirms to PEOPLE exclusively.

The couple’s son joins big brother John Ira Shepherd, 5, and sister, Junia Rosa Ruth, 2½.

“We are very excited to share the addition of George Abraham Walker Hanson to our growing family,” Zac tells PEOPLE. “Abraham is healthy and we are happily sharing a little down time together as a family.”

Their new arrival, who will go by Abraham, arrived at 8 lbs., 7 oz. (the same birth weight, coincidentally, as his sister) and has surely thrilled his siblings.

As Zac told PEOPLE in May, “It’s fun this time to watch the little ones so excitedly anticipating their new sibling.”

Added the drummer, “We are so happy and thankful to add more life and love to our family!”

— Rennie Dyball

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