The Kardashian girls know how to build familial bonds -- with a lot of toys!

Kim Kardashian bought a boatload of gifts (and we assume his undying affection) for her nephew Mason (and daughter North) at the Lego store on Wednesday. The whole fam has been looking a bit down after stepfather Bruce Jenner's bombshell interview last week -- it's possible Kim's trying to lighten the mood in the house with some retail therapy.

Kourtney's oldest son doesn't seem too jazzed about the plethora of presents -- but when you are a Kardashian kid and you probably get whatever you want, whenever you want -- all the Legos in the world probably won't make you happy.

For the toy-buying trip, Kimbo opted for her favorite pair of skintight white jeans by Mother, barely there Alexander Wang heels and a ripped cropped sweatshirt layered over a beige tank. That gal loves to pair her whites with neutrals!

In addition to being the pied piper of the Lego store, Kim's about to become an author (we use that term very loosely). Her new book of selfies, Selfish, is set to hit bookstores on May 5.