Head over to DL and see how your seat assignment falls on deaf ears. Even as a Diamond, it has happened to me multiple times and that's as a single flyer sitting in the exit row or economy comfort moved to a non-extra leg room seat somewhere near the back.

Since it wasn't clear, did you have multiple itineraries or is everyone on the same itinerary? If the are separate, AS (along with every other airline) has an automated rebooking tool that seats according to your original request, it may not be the same seats, but if you were booked in a window seat, you should get a window seat. It usually works by groups first and then top down from elite status holders to lowest fare general or non FF programs. The system doesn't do it by last name as there are folks who have the same last names that are not traveling together, nor related that all of a sudden are sitting next to each other.

What I find funny is that every single airline's CoC states that you are purchasing a space on the aircraft and seats are subject to change. And yet there are people who think they are staking claim to one particular seat. It amuses me.