I just heard that Kaddish is said for only 100 years after someone dies. Has anyone else heard this opinion and does anyone know why? This situation occurred as my grandmothers 100 yaherzeit is coming up and i was told you don't say Kaddish for more than 99 years.
It is sometimes quoted that Kadish and / or Yahrtzeit are not kept longer than 50 (not 100) years after the deceased's passing. Yet, The ספר ציץ אליעזר חלק יד' סימן עה, סעיף ב and ספר ציוני הלכה הלכות אבלות - Authored by הרב בן ציון הכהן קוק - in the name of R' Yosef Shalom Elyashiv, and R' Ovadia Yosef ספר חזון עובדיה על הלכות אבלות חלק ג' (עמודים רלז-רלח) all say that Kaddish and Yohrzeit are kept for even much longer.