Great Cafe's in Northfields
Skylight - light, airy, cheap but decent food. Great for sipping your latte and eating your toasted sandwick while the kids play safetly in the play area
Cila's Creperie - Good little outdoor area, cheap crepes which kids love with smoothies etc too
Roccoco- good little outdoor area and great sandwiches and coffees
Little Kickers - offers courses for the little ones - from as early as 1 yr to join in and kick a ball around - available in various Ealing locations and on a Sat too!
Bit further afield but great for a Sunday visit is the Isabella Plantation in Richmond - great for picnics, tree climbing, paddling. It's like a secret garden (all be it a very big one) within Richmond Park.
Barnes Wetland Centre - New outdoor play area, pond dipping etc. A bit expensive but good for a day out
Bunny Park in Olde Hanwell - great for a cheap day out - has the usual park things with a great play area and a mini zoo.
Snakes and Ladders at Syon Park- a bit tired but on a rainy day a great indoor play area which the kids love.
Kew Gardens - just fab especially with the new beach area.
The library is being done up and looks like it will be fab
Good for kids for lunch/dinner, all child friendly many with kids menu's -
Chains
Carluccios, Pizza Express, Zizzi, Gourmet Burget Kitchen, ASK (the one at Kew Bridge is particularly good)
More expensive but if you're celebrating
Ealing Park Tavern
Sam's Brasserie (Chiswick)
High Road Brasserie (Chiswick)