Q. If someone forgot to kindle a Yohrzait candle on that day for a father or mother, what is the correct thing to do. Should one light two candles when he/she remembers? What happens if someone just remembered in the Yohrzait morning, is lighting for part of the day enough?
A. If one forgot to kindle a Yorzait candle on that day for a father or mother, Yehuda Yaale (Y.D. 315) rules that he should donate the value of the light for tzedaka.
Horav Shlomo Miller’s Shlit’a opinion is that he should light a candle the day he remembers. Lighting the candle in the morning is also after the fact acceptable.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit’a