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Jul 01, 2026

Erin and Sara Foster’s Quotes About Relationship With Stepmom Katharine McPhee

Everything Erin and Sara Foster Have Said About Stepmom Katherine McPhee
Emma McIntyre/Getty Images for Netflix

Katharine McPhee may be younger than her stepdaughters Erin Foster and Sara Foster, but they still have a close bond.

The American Idol alum started dating David Foster in 2017, and the pair got engaged one year later. In June 2019, they tied the knot in London. News broke in October 2020 that McPhee was pregnant, and baby boy Rennie arrived in February 2021.

Throughout their relationship, David and McPhee have gotten backlash for their 35-year age gap. However, his kids are not pressed.

“Everyone has an opinion about something,” Sara said during a June 2026 appearance on Kristin Cavallari’s “Let’s Be Honest” podcast. “They’re 12 years in, and they are happy. … She’s a fully consenting lady, this is not, like, some child bride. She is in her 40s.”

David is the father of six kids, including Rennie. His eldest daughter, Allison, was put up for adoption following her birth and reconnected with her father in adulthood. He shares daughter Amy with ex-wife B.J. Cook and three kids — Sara, Erin and Jordan — with ex-wife Rebecca Dyer.

Keep scrolling to see what Erin and Sara have said about McPhee:

David Foster Family Guide: Meet the Musician’s Children, Stepchildren

Related: David Foster's Family Guide: Meet the Musician’s Children, Stepchildren

David Foster‘s family tree never seems to stop growing. The award-winning musician has been married five times in his life, which means he has a plethora of children, stepchildren, exes and, of course, his current wife, Katharine McPhee. In total, David has six biological children of his own: daughters Allison Jones Foster, Amy Skylark Foster, […]

July 2018

Following her dad’s proposal, Sara called McPhee “Mommmyyy” via Instagram.

September 2018

The siblings joked exclusively to Us that they “hope[d]” they’d get invites to their dad’s nuptials.

David “never looked better” while dating McPhee, Sara exclusively told Us. “He’s so happy,” she explained. “He doesn’t age. I said to him the other day, I’m like, ‘Are you on HGH? What is happening?’ He just looks so young.” Erin joked at the time that his “young fiancée” should take full credit.

February 2019

Sara called her future stepmom “really funny,” exclusively telling Us, “Katharine holds her tongue a lot. If I were her, I would be taking down trolls all day. I wouldn’t be able to star on Broadway because I’d be too busy taking down trolls.”

Amid rumors of McPhee and David spending millions on their wedding, Erin joked via Instagram: “There goes my inheritance.”

May 2019

We love our future stepmom,” Sara exclusively told Us. “Our dad’s very happy and we’re excited.”

August 2019

The sisters said during an event that they “fully expect [McPhee] to have a child and fully support it.” (McPhee welcomed son Rennie with David in February 2021.)

September 2019

“The truth is we really genuinely love Katharine,” Erin exclusively told Us. “It takes a very strong, graceful person to come into a family as the fifth wife and have adult daughters who are older than her and do it in a way that really creates inclusion with the family, and she just does it effortlessly. She just makes it really easy for all of us to get along. So we’re very grateful for her.”

Katharine McPhee Praises Stepdaughters Erin and Sara Foster for Nobody Wants This Success 313

Related: Katharine McPhee Praises Erin and Sara Foster’s ‘Nobody Wants This’ Success

Cindy Ord/Getty Images for Saks Fifth Avenue Nobody is more impressed with Erin Foster and Sara Foster’s work than their stepmom, Katharine McPhee. “I’m so proud of Erin and Sara,” McPhee, 40, exclusively revealed in the latest issue of Us Weekly, on newsstands now. “They have had their hands in so many things. They’re just […]

October 2019

Sara clarified exclusively to Us that McPhee wasn’t pregnant yet, saying, “Of course she wants a baby. I’m sure they’ll have a baby.”

November 2019

She called her dad and McPhee the “perfect couple” at an event, exclusively telling Us Weekly, “I don’t think they’ve ever had a fight. I watch them, I’m just like, they figured it out. It’s beautiful.”

April 2021

“You ever side-planked with your 37-year-old stepmom?” Erin wrote on her Instagram Story. “I have.”

May 2021

“Happy first mama’s day to Rennie’s mom,” Sara captioned an Instagram Story shot.

July 2021

Erin compared her and Katharine’s July 2021 workout with Amanda Kloots to “death.”

December 2021

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