On Eye-an and Teri's relationship: I believe these two truely have a love for each other and actually do enjoy doing things together. They appear to have an understanding that basically says, "Don't take what I say personally, its just me." It is kinda like members of the mafia when they say, "Nothing personal Tony, its just busness."
They have been married for many, many years and coming on the race together indicates they do like each other's company. The outward abrasiveness to each other and others in the race may just be there way of coping with at-the-moment stress because once the stressful situation is passed, they seem to be pretty normal.
That all said, it is still hard to watch their behavior, and it makes it eaven harder to be happy for them on their performance. But, they are doing well.