A natural spoken version: 「親戚の子が泊まりに来てから、忙しくなった。」 (Shinseki no ko ga tomari ni kite kara, isogashiku natta.) “Ever since the relative’s child came to stay, it’s been busy.”
Japanese homes, particularly modern apartments in cities like Tokyo or Osaka, are optimized for space efficiency. Hosting an extra person requires quick logistical changes: Standard Routine Adjustment for Guest Individual beds or designated rooms shinseki no ko kara to o tomari de kara
The phrase you provided appears to be a phonetic transcription of a Japanese sentence, likely written in Romaji. (Translation: I am here to stay overnight with
Shinseki no ko kara to o tomari de kara Better: Shinseki no ko to o-tomari shi-ni kite-imasu . (Translation: I am here to stay overnight with the relative's child.) replacing them with shared meals
Ultimately, "shinseki no ko kara to o tomari de kara" acts as a universal shorthand for a busy, lively, and slightly exhausting period of family bonding. It represents a break from the rigid academic and corporate schedules of Japanese life, replacing them with shared meals, late-night conversations across futons, and the reinforcement of extended family ties.
Meaning "because" or "after doing so."