It's been a few years since Caitlyn Jenner announced that she was transitioning and it caused a lot of tension in the family!
We've seen Caitlyn spend time with her other daughters Kylie and Kendall but it seems like she's lost contact with Khloé. Right now Caitlyn is on a reality show called "I'm a Celebrity...Get Me Out of Here" and while she was on the show she revealed that she hasn't spoken to Khloé in 5 years.
The two main reasons is because Khloé found out about Caitlyn's transition in the media after she had asked Caitlyn over and over about the "changes" she was going through and Caitlyn didn't tell her.
The other reasons was because Khloé didn't appreciate the interview that Caitlyn did with Vanity Fair where she said Kris Jenner made her feel inferior and weak.
Honestly, I can see where Khloé wouldn't want to talk to Caitlyn either for that but I'm sure that whole transition for Caitlyn was very hard. Maybe one day they'll make up.