The news comes as Stapp prepares for Creed’s first live shows in more than a decade.

That child, his son Jagger, is now a dad as well.

“I don’t feel like a grandpa!

Scott Stapp with son and grandchild

Scott Stapp with son, Jagger, and grandson, Cash.Courtesy Scott Stapp

But a grandpa I am.

And a proud one at that.”

Stapp has three more children with his current wife, Jaclyn, aged 17 to 6.

Scott Stapp

Scott Stapp.Matt Akana

That has informed the way he approaches fatherhood, telling PEOPLE that his kids are his “purpose.”

“They make me want to be a better man,” he said.

I’m proud of him.'"

“And ironically, without getting into too much, Jagger had some things that he went through.

Their tour starts with headlining appearances on the inaugural Summer of ‘99 cruise.

Daughtry, Switchfoot, Tonic, and Big Wreck will also perform on select dates.