I watched part of the marathon yesterday. In watching it I remembered the stress my brother and sister-in-law went through remodeling a duplex they bought. Constantly fighting. I mentioned it to them once and they acknowledged it and said that friends of their's said that they (the friends) had never argued so much as when they remodeled their house. I just think that we saw a couple adjusting to a lot of things all at once. They are still adjusting to themselves as a married couple, business partners (to answer a question above Jason worked to resolve the bottleneck problems when the skinny girl margarita was launched to more demand than they expected), new parents, new wealth (lots of good, but also lots of changes), new lawsuits, new home, etc. Anyone of these things involves a "who am I now" question that needs to be resolved and it crashed down on both of them all at once. I think that both showed their weaknesses and both showed their strengths. It was good to see that they were rising up out of that valley as a couple and a family at the end of the series.