May 31, 2013 01:00 PM

Dave M. Benett/Getty

There’s a new album — and another baby! — on the way for the Hanson family.

Youngest brother Zac and his wife Kate will welcome their third child together in the fall, he confirms to PEOPLE exclusively.

“We are so happy and thankful to add more life and love to our family!” the singer, 27, tells PEOPLE.

Equally ecstatic are the couple’s children John Ira Shepherd, 5, and Junia Rosa Ruth, 2½. “It’s fun this time to watch the little ones so excitedly anticipating their new sibling,” the proud papa adds.

But the baby’s welcome party extends far beyond his immediate family; Between Zac’s older brothers, the newest addition’s clan of cousins includes Isaac‘s two children Everett, 6, and Monroe, 4½, and Taylor‘s five children Ezra, 10, Penelope, 8, River, 6, Viggo, 4, and Wilhelmina, 8 months.

Hanson’s new album, Anthem, is out June 18.

— Anya Leon with reporting by Rennie Dyball

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