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Sheloshim is a Hebrew word meaning "thirty" and refers to the traditional thirty-day period of mourning following burial. Sheloshim includes the seven days of shivah. However, the twenty-three days following the conclusion of shivah are far less restrictive.
Yes. Even as Pesach, Shavuot, Sukot, Rosh Hashanah, and Yom Kippur curtail shivah, so do they frequently end the sheloshim. As the rules are somewhat complicated, your Rabbi can best advise you as to your individual circumstance.
After Shivah ends, mourners may return to work. The rules for the balance of sheloshim, however, wisely prescribe that they not immediately resume a normal daily routine. Specifically:
Sheloshim concludes the traditional mourning period for all loved ones, except for parents. Most mourners may return to a full business and social life.
As we have seen, traditionally we formally mourn the loss of parents for twelve Hebrew months, reciting Kaddish for eleven of them, while the other mourning restrictions of the sheloshimcontinue for the twelve-month period.