Jews in mourning are not required to go about their usual daily chores - friends help out instead.
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.
Black
Most of the Jewish liturgy is traditionally said in Hebrew, although Jewish law permits prayer in a person's native language. The various versions of the Kaddish are in Aramaic, the dominant language of the Jewish community 2000 years ago. In the Jewish liturgy, the Kaddish serves as a Doxology, that is, a liturgical punctuation mark at the end of each section of the service, separating it from what follows.A second unusual feature of the Kaddish is that the most well known variant outside the Jewish community, the Mourner's Kaddish, is said by mourner in memory of the dead, but does not once mention death or mourning. It is purely a prayer of praise.
Shiva
Here's an example: The Kaddish is the Jewish Mourner's prayer.
The prayer is called 'the mourner's kaddish'.
The 7 days of Jewish mourning.
Shiva isn't the funeral in Judaism. Shiva is the 7 days after the burial where the immediate family doesn't leave their home or do any work. Instead, people come to them to offer comfort and bring food. Levoya is the burial ceremony.
The Jewish
While all of the relatives should comfort the mourners and participate as is appropriate, the actual laws of mourning apply only to the following: the siblings of the deceased, the children of the deceased, the spouse, and the parents of the deceased. Excluded are nieces and nephews, in-laws, grandchildren, aunts and uncles, etc.
It's the initial 7 days of the Jewish process of mourning.
The "marriage rituals" would be dependant upon which religious beliefs the marriage was being conducted in accord with. Catholic marriages would conform to Catholic marriage rituals, Jewish marriages would follow Jewish rituals, Moslem marriages...you get the picture. In short the marriage rituals in Wales would be exactly the same as they would be anywhere else in the world.