DH=Dear (most times) Husband
DD=Dear Daughter, Dear Dad
DS=Dear Son
DM=Dear Mother, Dear Mom
DF=Dear Father
DSD=Dear StepDaughter
DSS=Dear stepSon
DSM=Dear StepMother
DSF=Dear StepFather
BIL=Brother in Law
SIL=Sister in Law
MIL=Mother in Law
FIL=Father in Law
DC=Dear Children