Keith Urban: Every Day Is a Milestone with My Children

Keith Urban

Steve Granitz/Wireimage

updated 08/25/2015 AT 8:16 PM ET

originally published 01/27/2014 AT 9:30 AM ET

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Things are getting weird in Keith Urban’s household.

Or at least that’s what his 5-year-old daughter with Nicole Kidman, Sunday Rose, thinks.

“Every week there’s something new going on. There’s a new move,” Urban, 46, explained on the red carpet at the Grammys – where he was nominated for best country duo/group performance for “Highway Don’t Care” with Taylor Swift and Tim McGraw. “There’s a new word in their vocabulary. Right now for Sunday, everything’s ‘that’s weird.’ ”

He continued, “Everything’s weird for a 5-year-old … sometimes she’s right!”

Sunday Rose and younger sister, 3-year-old Faith Margaret – who are “growing rapidly” according to Urban – weren’t onhand to witness their father’s spot on Sunday evening, where he performed “Cop Car” with Gary Clarke Jr.