To be very clear, there are no DOT rules or policies relating to "family seating." As others have noted, the COC not only does not guarantee specific seats, it makes clear that assignments are not guaranteed. That said, this was poorly handled by AA as it appears that at least three seats existed together had already been dealt with. At a minimum, that would have left each parent with a lap child and one parent seated in the same row with the 2 younger seated children, leaving open the possibility that the two older children might have been seated alone (but in the same cabin).
On the complaint front, it is important to distinguish between anti-semitic statements and the seating issue. The former is actionable and, I suspect that both AA and DOT will investigate if you make a specific complaint. Omit the entire seating issue other than to note that there was one and that was why you were interacting with the GA, e.g., "while dealing with the GA on a seating issue, he made the following anti-semitic comments....."