If you're looking for anime similar to WATATEN! an Angel Flew Down to Me Special, you might like these titles.
Kobo Tabata lives in a typical Japanese family. His father is a normal salary-man, his mother's a typical housewife, his grandparents (from his mother's side) help to take care of the family and it's pets, and his uncle's a slightly obese high school teacher. Still, they manage to find odd situations that sometimes arise due to Kobo's growing up process or simply because of their own habits and misunderstandings.
Nono-chan is the eldest daughter in the Yamada family and a third-grade elementary school student. Her family consists of her father, Mr Yamada Takashi, her mother, Mrs Yamada Matsuko and her brother, Noboru, a junior high student. Together with her grandmother, the family of five makes up a pleasant Japanese family. Everyone is special and everyday is always filled with joy and surprise.