D..
dd- darling daughter
xh - ex husband (I think)
JFF - just for fun
ds - darling son
ss - step son
sd - step daughter
LOL - laughing out loud
hth - hope this helps
bff - best friend forever
SAHM - stay at home mom
SAHD - stay at home dad
MIL - mother-in-law
DIL - daughter-in-law
FIL - father-in-law
SIL - sister-in-law
BIL - brother-in-law
I haven't seen one for son-in-law
ETA - here on this site, it means "edited to add"
SWH - So What Happened
DH either means darling husband or dickhead (excuse my French) according to who is saying it.
Have fun!
Dawn