Historically, Japanese families ( kazoku , 家族) operated on a strongly collectivist model. It was not unusual for cousins to live under the same roof for weeks at a time. The concept of uchi (内, inside the family) created an implicit trust: relatives were considered extensions of the parent’s own authority and care.
It might also be a from automatic transcription or machine translation. If you heard this in conversation, it could be dialectal Japanese from areas like Akita, Kagoshima, or Okinawa, where verb endings differ significantly from standard Japanese. shinseki no ko to o tomari dakara de na tesa
Consider a typical scenario: A 10-year-old child stays overnight at an aunt’s house, sharing a room with a 14-year-old cousin. The parents assume safety because they’re relatives. But the 14-year-old may have unsupervised access to the internet, age-inappropriate content, or simply poor judgment. Historically, Japanese families ( kazoku , 家族) operated
Or possibly it’s from a meme or song lyric? It might also be a from automatic transcription