Quote Originally Posted by HoneyBadger View Post
Is the letter apologetic? Is your wife trying to make amends? If so, sending it may yield healthy results.


Is the letter accusatory? Is she just speaking her mind? Don't send it.
What's wrong with her speaking her mind ? Sometimes one has to call a family member out. No matter how hard it is. It either cures or kills off the relationship. In her case might be better to do so. Outside the OP's post we really don't know the family dynamic. Based on his post the sister is a trouble making O2 breather. You want to mend fences with that?