Scozzie, Mikes bar and grill at Tom Ugly bridge has great food for kids and adults and is reasonably priced that said not much for them to do as it's just a restaurant. The Crest Hotel in Sylvania (Southgate Shopping Centre) is a different matter, soft play area for kids, great food and a good price, I think the play area is also free but you would have to check on that. There is a a Chinese Yum Char in blakehurst which is always full of youngsters and being a yum char they can pick their own food as the waiters/waitresses bring it round. There is a Tepenyaki at Sylvania Heights which is good fun as the chef likes to throw food into the kids mouths oh and raw eggs into their bowls, harmless fun but the kids we saw really enjoyed it, there's also a few Chinese places within a few minutes walk but don't do the buffet type menu, Jade Lotus is pretty good food though.
HTH
Dax