July 30, 2018 11:35 AM

Kim Kardashian West is thrilled that two of her younger sisters have joined the “Mom Club!”

At the City of Hope “If Only” Texas hold ’em charity poker tournament Sunday night at The Forum in Los Angeles, the reality star revealed how family dynamics have shifted since Kylie Jenner gave birth to daughter Stormi on Feb. 1 and Khloé Kardashian welcomed daughter True on April 12. (Khloé, Kris Jenner and Kendall Jenner also attended the event, which was hosted by Shelli and Irving Azoff.)

To start, Kim shared with PEOPLE that her two older children — Saint, 2½, and North, 5 — are embracing their new cousins. It even seems like the babies remind Saint of his own 6-month-old sister, Chicago.

“They love their cousins! Saint, every time he sees Stormi and True, he’s like, ‘I have a baby! Do you want to see my baby?!’ He is so obsessed with having a little sister. It is really, really cute,” Kim said. “They are all so good together, but I think Saint is probably the most excited about all of the babies.”

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The Kardashians and Jenners at the City of Hope poker tournament
Rich Fury/Getty
Kris Jenner and Kim Kardashian West
Rich Fury/Getty
The West family
Kim Kardashian West/Twitter

RELATED: Saint Gives Sister Chicago a Sweet Smooch in New Snap Shared by Dad Kanye West: “We Got Love”

Kim, 37, added that watching her sisters learning the ropes of motherhood has also been fulfilling.

“I don’t know what the word is — not really an ‘I told you so,’ but … ‘Okay, you get it now. Welcome to the ‘Mom Club,’ ” she said of Kylie, 20, and Khloé, 34.

“They finally understand what it is like when I am really tired at work, when I’ve been up and feeding all night long, or things like that, those things they really didn’t get,” Kim explained. “It’s fun to see them really understand it now.”

Kylie Jenner and her daughter Stormi
Kylie Jenner/Snapchat
Khloé Kardashian holding her daughter True
Khloe Kardashian/Instagram

RELATED VIDEO: Kylie Jenner Says There’s “Nothing Better” than Holding Her Daughter Stormi: “My Little Love”

Kendall, who’s the only one of the KarJenner sisters without any kids, has also been enjoying her rapidly growing family. “I love all of my nieces and nephews — I like that I can give them back,” she said, laughing.

“But I do feel … a really special connection to Stormi,” admitted the 22-year-old model. “I don’t know if it’s that Kylie is my little sister, but I was hanging out with her the other day at lunch, and we were just sitting, and she was just so comfortable with me, and it made me so happy.”

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