Futako Tamagawa is a great area to visit if you want to do some shopping. There are several shops worth seeking out, notably Tsutaya bookstore and Takashimaya department store.
Keitei is a tonkatsu shop in Takashimaya that serves a variety of vegetables with the breaded and deep-fried pork. I love the presentation of the julienned cabbage, pickles, and kombu Tsukudani. The cabbage salad can be dressed with an aromatic yuzu or creamy sesame dressing. Keitei is part of the Wako group that specializes in tonkatsu.
As it is in a department store it is kid-friendly.
Futako Tamagawa Takashimaya 6th floor of the South Building (Minami-kan)
Setagaya-ku, Tamagawa 3-17-1 世田谷区玉川3-17-1