Please add any I've forgotten.
(there are others like CV's sons who haven't played a part yet, and haven't been in the media)
AlC = Alex Cox (Lori’s brother, died 2019)
AdC = Adam Cox (Lori’s brother)
AnC = Annie Cushing (Joe Ryan’s sister)
AR = April Raymond (Lori’s friend)
BB = Brandon Boudreaux (ex-husband of MBP)
BC = Barry Cox (Lori’s father)
BD = Benjamin Douglas (Tammy Daybell’s brother)
CD = Chad Daybell
CP = Christopher Parrett (owner of AVOW, Another Voice of Warning)
CR = Colby Ryan (Lori’s son)
CV = Charles Vallow (died 2019)
DW = David Warwick (MG’s friend)
EM = Emma Murray (Chad and Tammy Daybell’s daughter, married to Joseph)
GB = Gabe Bonilla (CV's friend/witness/Bishop)
GD = Garth Daybell (Chad and Tammy’s son)
HD = Heather Daybell (MtD’s wife)
HS = Hector Sosa Jr. (author, creator of internet forum Pathway to Zion; PTZ)
IP = Ian Pawlowski (husband of MBP)
JC = Janis Cox (Lori’s mother)
JD = Jack Daybell (Chad’s father)
JG = Jason Gwilliam (Tammy Daybell’s sister-SG’s husband)
JJ or JV = Joshua Jaxson Vallow
JM = Jason Mow, aka Richard J Mow (ex-police, friend)
JoR or JR = Joseph Ryan aka Joe (Lori’s 3rd husband, died 2018)
JuR = Julie Rowe (Chad’s friend)
KR = Kelsee Ryan (CR’s wife)
KW = Kay Woodcock (JJ’s paternal grandmother)
LM = Leah Murphy (Chad and Tammy Daybell’s daughter, married to Adam)
LVD = Lori Vallow Daybell (nee Cox)
LW = Larry Woodcock (JJ’s grandfather, husband of Kay)
MBP = Melani Boudreaux Pawlowski (Lori’s niece, nee Cope. aka MB pre-marriage to IP)
MkD = Mark Daybell (Chad and Tammy’s son)
MwD = Matthew Douglas (Tammy Daybell’s brother)
MtD = Matt Daybell (Chad’s brother)
MiD = Michael Douglas (Tammy Daybell’s brother)
MG = Melanie Gibb (Lori’s friend)
NP = Natalie Pawlowski (ex-wife of IP)
PD = Paul Daybell (Chad’s brother)
PhD = Phyllis Douglas nee Cooper (Tammy Daybell’s mother)
RD = Ron(ald) Douglas (Tammy Daybell’s father)
SD = Seth Daybell (Chad and Tammy’s son)
SG = Samantha Gwilliam (Tammy Daybell’s sister, married to JG)
SLC = Stacey Lynne Cope (Lori’s sister, nee Cox, died 1998, mother of Melani; MBP)
SC = Steve Cope (MBP’s father, formerly married to SLC)
SD = Sheila Daybell (Chad’s mother)
SS = Summer Shiflet (Lori’s sister, nee Cox)
TD = Tammy (Tamara) Daybell nee Douglas (died 2019)
TR = Tylee Ryan
ZC = Zac Cox (AdC’s son)
ZP = Zulema Pastenes (AlC’s wife)