DS, DH, DD, DW - I have no idea what these stand for and can only surmise that they stand in lieu of son, husband, daughter, and wife, respectively. but what’s the D?
For the game section it means [name_u]Dream[/name_u] husband, [name_u]Dream[/name_u] son, etc, however for the other sections when they are talking about real people, it means Dear Husband, Dear son, etc, from what I understand.