This Brookline favorite recently welcomed three Cambridge siblings, but there are no growing pains here. Bouquets of chocolate roses bloom behind the counter, plum and pecan tarts bedeck charming antique shelves, and a sweet, buttery scent suffuses the air. This is the actualization of every dream you’ve had of Paris, where the pastries are as good as they are gorgeous, and there’s nothing that a slice of cherry clafoutis can’t solve. It’s really no coincidence that Tatte’s croissants are shaped like smiles.