Mildred, cahn, the FW micromanaging orders for mourning for ordinary citizens are fascinating and very FW/Prussian. Since they are written in the font you like to much, I shall translate:
Parents for children who were older than twelve years: three months. For children younger than twelve years: no mourning.
Biological parents, grandparents, great-gandparents: are to be mourned for six months. Adopted or stepparents as well as aunts: only thirty days.
Widow for her husband: exactly a year and no more. Widower for his wife: half a year and no more.
Parents-in-law: half a year, no more.
People who made you their universal heir, even if they're not related to you: six months, if you like.
Brother, Sister, brother-in-law, sister-in-law: no more than three months.
Re: Various questions from Mildred
Parents for children who were older than twelve years: three months. For children younger than twelve years: no mourning.
Biological parents, grandparents, great-gandparents: are to be mourned for six months. Adopted or stepparents as well as aunts: only thirty days.
Widow for her husband: exactly a year and no more.
Widower for his wife: half a year and no more.
Parents-in-law: half a year, no more.
People who made you their universal heir, even if they're not related to you: six months, if you like.
Brother, Sister, brother-in-law, sister-in-law: no more than three months.