The toddler smiled for the camera, to the delight of the proud mom

Angela Andaloro is a Parents News Writer at PEOPLE. She has been working at PEOPLE since 2022. Her work has previously appeared on BuzzFeed, Entertainment Weekly, and LittleThings.

Khloe Kardashian Puts Mustache Filter on Son Tatum and Calls Him Brother Rob Kardashian's 'Twin'

Tatum Thompson(L), Rob Kardashian (R). PHOTO: KHLOE KARDASHIAN/SNAPCHAT; ROB KARDASHIAN/INSTAGRAM

Khloé Kardashian continues to marvel at the resemblance between her baby boy and her baby brother.

The Good American co-founder, 39, shared a photo of son Tatum, 17 months, donning a faint mustache filter and smiling at the camera.

“My brother’s twin!!” she captioned the shot, referring to brother Rob Kardashian as she shared the photo to her Snapchat Story.

The mom of two also shared adorable photos of daughter True, 5½, with her curly hair framing her smiley face as she posed in a Spice Girls t-shirt.

Khloe Kardashian Puts Mustache Filter on Son Tatum and Calls Him Brother Rob Kardashian's 'Twin'

True Thompson in her Spice Girls t-shirt.KHLOE KARDASHIAN/SNAPCHAT

True wears the shirt as she enjoys time with her cousins —  Kim Kardashian’s younger pair of kids, Psalm, 4, and Chicago, who turns 6 later this month.

In one photo, True cuddles with Psalm. In a later video, she and Chicago enjoy a fun-filled outdoor dance party, bopping around to Pharrell’s “Happy.”

“These girls and their dance moves,” she captioned the video.

Khloe Kardashian Puts Mustache Filter on Son Tatum and Calls Him Brother Rob Kardashian's 'Twin'

True Thompson and Psalm West.KHLOE KARDASHIAN/SNAPCHAT

Last month, Khloé shared photos of Tatum making some cute faces at the camera that his mom was enamored with.

“He knows what he’s doing with that face ♥️,” she wrote, adding the hashtag “#BabyRob,” referencing Tatum’s resemblance to his uncle Rob as a kid.

Kris Jenner commented, writing, “Ummmm yes he does 😍,” as other commenters praised Tatum’s cute expressions and full cheeks as he smirked.

Khloe Kardashian Puts Mustache Filter on Son Tatum and Calls Him Brother Rob Kardashian's 'Twin'

True Thompson and Chicago West.KHLOE KARDASHIAN/SNAPCHAT

Khloé said her little ones “had the best time” with their cousins during an impromptu New Year’s Eve ski trip to Deer Valley, Utah.

“We went with Kim, her four kids, our friend Natalie with her two kids and me and my two kids! So it was a big group,” Khloé shared.

As for skiing, she said True “did so well,” adding, “I’m so proud of her for being so brave and she ended up loving it! Especially skiing and having fun in the snow with her cousins.”