I’m not sure what you mean by "shinseki-no-ko-to-o-tomari-dakara." I’ll assume you want a complete article explaining and exploring the Japanese phrase "親戚の子ことを泊まりだから" or a similar phrasing about "staying over because of a relative's child" (or "親戚の子を泊める／泊まる") — I’ll produce a clear, complete article about the cultural context, grammar, etiquette, and examples for the phrase meaning "having/hosting a relative's child stay over." If you meant something else (a song, title, or different wording), tell me the exact Japanese and I’ll adjust.
This article will explore three main pillars: The Emotional Burden, The Logistics of Hosting, and The Cultural Nuances of "Kazoku" (Family). shinseki-no-ko-to-o-tomari-dakara
It is highly unusual to encounter a keyword like 「しんせきのこ と おとまり だから」 (Shinseki no ko to otomari dakara). …then I would be glad to help research
The "O-tomari" (sleepover) aspect is the peak of this bond. Unlike a standard playdate, the overnight stay allows for: it is not natural
…then I would be glad to help research and write a detailed report on the actual topic.
So loosely: “Because (it’s) an overnight stay with my relative’s child…” or “Because (I’m/we’re) staying over with a relative’s kid…”
But as a keyword, it is not natural, nor does it match an existing book, movie, song, meme, or trending phrase. It reads like a fragment of a sentence, possibly mistyped, mis-romanized, or taken out of a larger context (e.g., from a grammar exercise, a subtitle line, or automatic speech recognition).