Though mom-of-two Kim Kardashian has revealed in the past that daughter North West was extremely jealous of her 20-month-old brother Saint, the reality star is now admitting that this "phase" has no end in sight! The 36-year-old Keeping Up With the Kardashians star filled in for Kelly Ripa as guest host on the Monday, Aug. 28, episode of LIVE with Kelly & Ryan, where she revealed to Ryan Seacrest the magnitude of the sibling rivalry going on in their home.

What began as North not wanting Kim to breastfeed her baby brother has turned into a full-on saga, culminating in the toddler making Saint cry on the reg. "I mean, I don’t know if it’s because she’s the older sister — I don’t know what it is. I thought it was a phase — she does not like her brother, it’s so hard for me," Kim admitted. "I thought it was like, 'OK, a couple months, she’s just warming up to it.'"

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The Wests.

But almost two years into this whole sibling thing, North still isn't happy with the situation. In fact, the braid-loving beauty is keeping her tune ice cold. "She got so jealous when I would breastfeed and stuff," Kim continued, "and now, the phase isn't going away."

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And according to Kim, North's getting more sneaky and passive aggressive with the ways in which she tries to exclude her parents' only son. "Her thing is, she thinks she’s outsmarting me," Kim added. "She'll say, 'We’re having a tea party, mom. No boys allowed. Dad can’t come too then — no boys!' And then she’ll slam the door on her brother’s face and he’ll just start crying."

It's actually not the first time Kim has expressed concern over North's feelings toward Saint. Earlier this year, she revealed on The Ellen DeGeneres Show that her daughter bullies the tot. "North just beats him up all day long and he doesn’t cry," she shared.