We have seen on Keeping Up With The Kardashians that Kim takes more of a "tough love" approach with Rob than the rest of the family, so that might explain some of the tension.
The good news is that it looks like they're getting along much better now! Yesterday, Kim was tweeting about her morning sickness and while we all love reading her updates, we forget that the rest of her family is reading them, too. And, in this case, Rob replied.
We have no idea what that particular voice note was, but Kim's reply told us a lot about the current status of their relationship. "should I post it? I think people would love to hear the voice notes u send me!" she wrote.
We would love to hear them, too! And you don't send voice notes to someone you're mad at, so it looks like it's all good with Kimmie and her little bro and we couldn't be happier to see them getting along again.