WATCH: Kim Kardashian Thinks Kourtney is Too ‘Indecisive’ and ‘Stubborn’ to be Executor of Kris Jenner’s Estate

Kim Kardashian says it straight to Kris Jenner about why older sis’ Kourtney should not be the “executor of the estate and the decision maker for (Kris's) life.”

And Bruce agrees.

In this new clip from an upcoming episode of season 10 of Keeping Up with the Kardashians, Kim throws Kourtney under the bus and explains to her 59-year-old mother, “That’s heavy stuff. Kourtney is the most indecisive person on the planet.”

Bruce, 65, agrees. “She can’t even decide decide on what wallpaper she wants in her house.”

“She is really stubborn,” Kim adds. “She can’t ever make a decision. And she’s just not as smart as I thought she was when I was growing up.”

“I should be the one to make the decision,” suggests Bruce.

“No. Definitely not,” Kim replies. “I truly think I’m the most level-headed.”

Bruce agrees and says, “I would vote for that.”

Either way, they get Kris thinking that Kourtney is the wrong choice for this big decision.

Watch KUWTK on Sundays at 9 p.m. ET on E! and find out what happens.