I believe mostly all of the buffets in WDW have both food for adults and a kids buffet. Most of them also have "adult" beverages you can order
Some dinner buffets & Family Style aka "all you can eat without having to get up and get it" to consider:
Buffets
TEB-that's a fun one (probably the best value on property)
Cape May Cafe-Clam Bake Dinner
Family Style
WCC- not a buffet but they have an "all you can eat skillet" which is "mighty" yummy and several kids selections on the menu and you're guaranteed a rootin' tootin' time
O'Hana-another "all you can eat" style and you can order a variety of kid's items-and some fun activities for the kids!
Character dinners (buffets)
1900 Pk Fare-Cinderella and friends character dinner
Chef Mickey's-all of the "prime" Disney characters there
Gulliver's-has a buffet and you can order from the menu, there's a children's menu as well
At the Parks:
Epcot-Garden Grille-character dinner- Family style
MK-CP-character buffet
MK-LTT-Family Style
MGM-H&V-Buffet
Not sure if you can get a drink at the MK restaurants or not, I know there is beer at the Garden Grille
