Maybe 'worse than an IA'?
Two of my nieces (sisters) are currently fighting. One is pregnant, and the other's fiancé can't have children. Instead of acknowledging she is hurting because she wants a baby, she is attacking any flaw she finds in the other's boyfriend. The other sister, twin of the one who is pregnant, is trying to play neutral peacemaker, but the one who is upset and angry seems to think everything being said is negative toward her. It is a huge mess, and it true modern fashion, it is all being done publicly on Facebook. The twins are 20 and the other one is 22, so despite my desire to step in and give one of my aunt Tam talks, I am trying to keep quiet and remember they are adults even if they aren't acting like it.
What makes it all worse is they have always been so close. Ever since the oldest started dating her fiance they have been nit picking at each other about little things. It never happened with previous boyfriends. He is hard to love (by the rest of the family) and she is changing since meeting him. Nothing horrible, but she is changing, and not for the better.