If its any consolation you are not alone. My IRS filing was rejected last week as I found out my EXW used my youngest SS# as a dependent for the 2nd year in a row. So now its back to court.
My Exsil's ask me how I remain calm when there sister is such a selfish B#%%%#. They know pretty much what i'm going to say. "I can't control her behavior, I do what is necessary". I also normally laugh and say that all this has taught me that the internal peace I've gained through my own MLC and her's has been a blessing in my life.
I swear we don't know where this journey is leading us but if we allow it to carry us authentically through without too many preconceived notions it leads us to a place that is better for us........and then in turn teaches lessons to those who are watching us. What a legacy to leave your kids and your close friends and people you meet along the way.