Before I answered I checked the disney dining reservation website and put in a party of 12 on Thanksgiving for dinner. The options I saw that had availablility BEFORE 8pm (b/c of the 2 yr.old) were:
Boatwright's
Boma
Hollywood and Vine
Hacienda de San Miguel
Nine Dragons
Olivia's Cafe
Restaurant Marrakesh
Shutters
Trail's End
Wolfgang Puck Cafe
There were some others, but they had reservations starting at 8pm on and I thought with the 2 yr. old you would want to eat dinner earlier than that.
Of the above I personally like Boma and I have heard the buffet at Trail's End is very good if yu want more traditional American food (that is where one of the CMs I spoke with about Thanksgiving dinner told me he eats).
I was not sure if you wanted ethnic or more traditional, but you can see what is available at anytime on the WDW website.
Good luck-maybe we will see you in the parks