I have a thought, just a thought, regarding why LA was so hurt about being left out once KC's pregnancy was known. Imagine how life was for him, living in that house. He was a young man that was looking at this through a young man's eyes. Mom is a very controlling woman. Like most brothers, he was probably thinking of how much trouble his sister was going to be in from his mom. Instead of the reaction he expected, he saw the shopping trips and money spent on his sister. He probably felt like "I've been good and get no attention and she does this and gets everything." I am sure there was a bit of jealousy there, and guilt over feeling the envy.