The anime series is available on various online platforms, such as Crunchyroll, HIDIVE, and Amazon Prime Video, although availability may vary depending on your region. -ENG- Ane Oyako de Iku-
However, I suspect that you might be referring to a specific anime, manga, or light novel series titled "Ane Oyako de Iku" (also known as "Going with an Older Sister" or "Elder Sister Trip"). If that's the case, here's a brief report: