It is forbidden to extend a greeting of “Shalom” to a mourner throughout the morning period, including the twelve-month period after a parent’s death. The mourner, however, may extend such a greeting to others after the seven-day Shiba period. Other greetings are permissible, but a mourner should not engage excessively in conversation, and joking is forbidden in a house of mourning. One should not send a gift to a mourner throughout the mourning period, except on special occasions, such as for a bar misva, wedding, holiday and the like.>>>>>>>
Adopted from the shiurim of Ha Rav Eli J. Mansour .