We all LIKE being right, but some people HAVE to be right as a matter of power and control over others. These people are very rigid in their thinking patterns because they don’t allow that others may have equally valid opinions or ways of doing things. While it IS true that sometimes we indeed have to draw a line-in-the-sand regarding what we consider “right,” and “wrong,” most conflicts between family members or other intimate relationships involve issues that usually are in the “gray” area rather than being starkly black and white.
To be less angry. let go of those “gray” issues (and even some of the black and white ones, if you can). Remember that while you may be technically “right,” the emotional cost of holding on to your righteousness may indeed by very high. What good is it to be right if its cost is the generation of hatred or emotional distance in a family member?