You don't ring the doorbell and/or yell at the door. Jews in mourning have their doors unlocked, so you walk in quietly.
If the family is Orthodox, you can bring kosher food to their home.
Black
Shiva
The 7 days of Jewish mourning.
Following the loss of a spouse, sibling or child, the Jewish mourning period is 30 days. Following the loss of a parent, the Jewish mourning period is 12 months, but the ritual functions that distinguish the mourner during the synagogue service are suspended after 11 months.
Jews in mourning are not required to go about their usual daily chores - friends help out instead.
It's the initial 7 days of the Jewish process of mourning.
The only color associated with Jewish funerals is black.
Judaism has a very structured process of mourning the deceased. After the initial 7 day period of intense mourning, the mourners then progress into a 30 day period of mourning that has fewer restrictions on activities the mourners are allowed to participate in. This is to insure that the mourners are allowed the time to work through their grief over the death of a loved one. For a more detailed explanation of the mourning process in Judaism, please visit the related link.
The question actually answers itself, since Shiva means seven in Hebrew. The intense mourning lasts seven days. This is a Jewish law applicable to all Jews, though some might ignore it or dilute it.
This entirely depends on what "stuff" you celebrate.Here are the major Jewish festivals: http://judaism.answers.com/jewish-holidays/the-jewish-holidaysAnd a few other occasions:http://judaism.answers.com/jewish-philosophy/jewish-life-cycle-brit-bar-mitzvah-wedding-death-and-mourning
Boys and men are given skullcaps for their heads and they learn the Jewish traditions and they eat kosher food.
Jews congregate in synagogues for prayer, study, celebration and mourning.