When there is a double Adar when would the yarzheit of a person be who was deceased in a single Adar? Would it be in Adar alef or beit?
Answer:
Shulchan Aruch (668:7) writes that one should observe the yarzeit on Adar Sheini, whereas Rema brings that some say it should be observed on Adar Rishon, and adds that some observe both. Mishnah Berurah (668:42) writes that the final opinion (both) is the principle halachah.
