We all know the drill: you settle into your carefully selected seat, then some jerk comes over, "Oh, hi can I switch seats with you, so I can sit next to my (fill in the blank: son/daughter/wife/mistress/secretary/partner/dachsund, etc)? So, you end up sitting in some random place which is always the most inconvenient possible place by Murphy's Law. At least they don't have smoking anymore. That was the worst, getting moved to the smoking section.
If there is anything worse than having some random guy ask to switch seats, it is getting forcibly reseated by the airline. Witness Ann Coulter's meltdown over losing her selected extra leg room seat because some dude wanted to sit with his 17-year-old daughter.
My question: how exactly does this play out? The guy books his travel with no assigned seats (seems unlikely), or possibility B, Coulter already has the aisle seat, so he books seats E and F (middle and window) for himself and his son, and some random seat for his daughter. Then he gets to the gate and before boarding starts, goes to the desk and says, "Hi, I am travelling with my daughter, but she is not seated next to me. Can she be moved next to me?" and the agent at the desk, says no problem and switches the daughter with Coulter. Is that typically what happens in situations like this?