According to Jim: Season 6, Episode 10 - ProjectFreeTV

6 - 10: Separate Ways

While Ryan is away, Dana and baby Tanner are staying at Jim and Cheryl's, until Jim starts complaining about the presence of the baby, so Cheryl wants him to stay at Andy's for a while. While Jim and Andy enjoy their male bonding, Cheryl and Dana are enjoying their time together too. At least, until Ryan returns.