Creatures Family Days (Frankenstein Family) (実験品家族, Shiyan Pin Jiating; Jikken-hin Kazoku) is a Taiwanese manhua written by Yanai. It is later serialized by Shinchosha's Monthly Comic @Bunch seinen manga magazine, which is published in Japan on October 21, 2017. The anime adaptation premiered on April 9, 2018.
Tanisu's parents are mad scientists who live outside of normal society. They locked up their own children up on an isolated island and did experiments on them in secret, turning Tanisu's older siblings into strange creatures. One day, their parents were arrested, and the siblings were moved to another island by the welfare office. The trouble is that none of the siblings except Tanisu know how to interact in modern day society..