The This Is Us cast really is family!

On Tuesday (February 22), Mandy Moore stopped by The Kelly Clarkson Show where she opened up about her son Gus, who just turned a year old the other day.

During her interview, the 37-year-old actress revealed that one of her This Is Us co-stars taught her how to change diapers.

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“It’s funny, because I’ve been playing a mom on a television show for six years and I’m like, ‘Wait, can we go back to the beginning now, because I know what it’s like to be a mom. I’ve been faking it!’” Mandy recalled.

She then went on to reveal that Milo Ventimiglia was the one that taught her how to change a diaper, adding that “I just remember having to lean on Milo so hard.”

Even though he doesn’t have kids of his own, the 44-year-old actor has taken care of his nieces and nephews over the years.

“He was showing me how to swaddle, how to change diapers. He was incredible,” Mandy said.

If you missed it, NBC just announced the date when the This Is Us series finale will be airing.