(親戚の家に泊まるから)
→ It could be a garbled way of saying: or "Because of staying with relatives, this thing..." shinseki o ko to wo tomari da kara
The phrase Shinseki o Ko to wo Tomari da Kara is rich in symbolism. Here are a few possible interpretations: or audio clip)
If you can provide the original context (anime title, scene, or audio clip), I can help identify the exact correct line. shinseki o ko to wo tomari da kara