Barcelona's restaurant scene is one of a kind. It's a city with something for everyone including high-end tapas restaurants, greasy spoon joints and a host of 'diner-style' locales as well as tasty bistros. Most restaurants these days have a wide selection of food including vegetarian options and 'child-friendly' dishes for the less adventurous folk. The city's Old Town (Ciutat Vella) has an overwhelming number of restaurants per capita. You can walk through the Gothic Quarter and 'menu shop' or go to Plaza Reial right off La Rambla and choose from a series of gorgeous terraces.
Family-friendly in Barcelona pertains to a vast number of restaurants as most places welcome children and have an unassuming vibe. You don't have to dress up or leave the kids at home to dine at the majority of the city's establishments and even places serving nouvelle tapas usually have great options for kids or those who want to stick to the basics.
As Spanish and Catalan food is grounded in meat, rice, salad and potatoes, no matter where you go there's always something homey and great for all family members. A few notable areas of the city to find great family-friendly places to eat are in Ciutat Vella as well as Gracia.