I don't see why everyone is excluding tax and tip - that's about 25% added on to the bill and 25% of $100 is $25/meal, a real sum that adds up quickly.
To buy 3 adults meals, 3 adult non-alcoholic beverages, and 1 kids meal with included beverage (which may or may not always be big enough to share - the 2 year old may need to sometimes share with an adult) will be very hard to find, especially if you want to actually eat from the menu. You have to have a total before tax and tip of around $80...the beverages alone will be $10 (for 3), the kid's meal will be $10-$12, so you have roughly $58-$60 to cover 3 adult entrees...
You are probably better served eating CS or heading offsite if you want a casual chain dinner price for your family...coupons and deals abound off-site...
But if you must make this work for DH, best bets are the cheapo sitdowns that do burgers and sandwiches...but then why not just CS burgers and sandwiches? They aren't that much better sitdown, except for the guaranteed AC and chair, which you pay extra for (aka - it's a tipped meal)...