Recently Bro. Mickels presented a serious of lessons on the topic: Building a Better Church Through Building Better Relationships.
For your convenience, here is the entire series of lessons on audio.
Lesson 1: Brethren1 (4.6M WMA File)
Lesson2: Attitudes for Better Relationships (4.4M WMA File)
Lesson 3: Attitudes that will Hinder Relationships (5.5M WMA File)
Lesson 4: The Role of the Tongue in Building Relationships (4.3M WMA File)
Lesson 5: Can We Control Our Tongue? (5.1M WMA File)
Lesson 6: Specific Ways to Improve Our Relationships (5.7M WMA File)