Who is oba Chan in sadako?

Oba Chan is a character in the "Sadako" film series, particularly associated with the "Ring" franchise. She is portrayed as Sadako's grandmother and plays a significant role in revealing more about Sadako's backstory and the cursed legacy that surrounds her. Oba Chan's character adds depth to the narrative by providing insights into Sadako's tragic life and the origins of the curse that haunts those who encounter it.