Inside the Divide Between the Kardashians and the Jenners

Bruce Jenner (second from left) with his three sons Burt (left), Brody and Brandon (Alexandra Wyman/Invision for PMKBNC/AP Images)

(People) – Bruce Jenner might have said it best on the season 10 premiere of Keeping Up with the Kardashians when he said that he felt “so separated” from the Kardashian family following his split from Kris Jenner. “Kardashians over here and the Jenners over here,” he told stepdaughter Kourtney Kardashian. “Little me in the middle.”

Their exchange reflected what was going on behind the scenes: Bruce, 65, was undergoing a gender transition and the Kardashian side of the family, though supportive, was having a difficult time dealing with the bombshell.

“The whole transition was much harder for the Kardashian kids and Kylie and Kendall,” a source close to the expansive Kardashian-Jenner clan tells PEOPLE. “It was hard to grasp. And there was a lot of lying to the kids over the years on Bruce’s part, even as close as they were. It’s going to take some time for the kids to get used to it all.”

Following the broadcast of his 20/20 interview with Diane Sawyer in which he revealed his intent to transition, every one of his family members – including Kris – extended their support to Bruce, be it by Tweet, Instagram or Today show interview.

However, one member of the family appeared to resent the sudden influx of support. “Having a hard time not putting a few people on blast who were not supporters beforehand, but want to act like they were all along,” Bruce’s son Burt Jenner, 36, wrote in a now deleted Tweet that appeared to be directed squarely at the Kardashians.

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