Similar issue happened to my family on American, seats were all purchased together but on check-in were reassigned. Happened for all four flights round trip, an

Similar issue happened to my family on American, seats were all purchased together but on check-in were reassigned. Happened for all four flights round trip, and at least once our 18 month old was assigned an aisle seat on his own, rows away from either me or my wife. It was like pulling teeth to get it fixed every time.