R.J.
DH dear husband
DW dear wife
DS dear son
DS# (Like Ds7 would be dear son age 7 ... ditto any child DD15 dear daughter age 15)
DSS dear step son
SS step son
DD dear daughter
DSD dear step daughter
SD step daughter
STBXH soon to be ex husband
STBXW soon to be ex wife
MIL mother in law
FIL father in law
BIL brother in law
SIL sister in law
TTC trying to concieve
PPD postpartum depression
Dear can also = darling. Removing the D : My H, etc. also works.