My grandfather died on Krishna Paksha Ashtami — should I perform Shradh on Pitru Paksha Ashtami or Shukla Paksha Ashtami?

Pitru Paksha’s Ashtami Shradh (Krishna Paksha Ashtami of Bhadrapada) covers ALL Ashtami tithis throughout the year — both Shukla and Krishna Paksha Ashtami of every month. So yes, if your grandfather died on Krishna Paksha Ashtami in any month, Pitru Paksha Ashtami Shradh (October 3, 2026) is exactly the right day for his annual Shradh.