Hiya! How old are the kids? What kind of food do you like?
IMHO, the best place to dine and see the MK fireworks is California Grill. We've had several good experiences here - food, in our experience is great - and the view is awesome. You can get up and go outside to the roof deck if you want a better view.
Narcoosees at Grand Floridian also has a great view, and here you can also go out to the deck if you want a better view. However - I'm not a fan of the food for a signature. Others disagree, and I will say the kids enjoyed the ambience and the food here.
The other option for fireworks is Epcot for Illuminations. There are views from Rose and Crown (I like the food here, haven't eaten during the fireworks) or La Hacienda (the views aren't plentiful or great but the food is good.)
Any of these options, of course, depend on timing you adr so you are dining during the fireworks. My other thought would be to eat earlier either in Epcot or MK area and then watch the show afterwords. Easy to find a space in Epcot...in MK area, they pipe in the music to Poly beach and you can certainly watch from there.
Have SO MUCH MAGIC!!!