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'RHOBH' Sister Drama: Kyle Richards & Kathy Hilton at Odds?

'RHOBH' Sister Drama: Kyle Richards & Kathy Hilton at Odds?
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People magazine reports that just as Kyle Richards and her sister Kim Richards are working through their relationship drama, Kyle and her sister Kathy Hilton are at odds.

An insider confirms to People that, "Kyle and Kim are still working on their issues, and now, Kathy and Kyle aren't speaking."

It seems the problem stems from Kyle's husband Mauricio Umansky, who left Kathy Hilton's husband's firm to launch his own, a direct competitor. This isn't a recent event, but bad feelings over it seem to have been rising over time.

"Mauricio isn't even welcome in the Hilton house," the insider claims. In addition, neither Kim nor Kyle were invited to Kathy's annual Christmas party on December 12.

The insider concludes, "It's sad that even over the holidays, they still can't get along.