Most everything is child friendly on Thanksgiving.
Peabody Resort on International Drive...Capricco's has a wonderful Thanksgiving day buffet. (we have been many times)
Swan/Dolphin (check out swandolphin.com)..has many, many Thanksgiving day meal options. Menus are posted.
Gaylord Palms resort has multiple thanksgiving day options. (gaylordpalms.com) Menus are posted.
Almost every major hotel will more than likely have a buffet or special holiday meal Thanksgiving day.