Generally accepted bbreviations used in US Census and genealogy
A   Aunt
AdD Adopted daughter
AdS Adopted son
At  B   Brother
BL  Brother-in-law
Bo  Boarder
c   Cousin
D   Daughter
DL  Daughter-in-law
F   Father
FB  Foster brother
FF  Foster father
FL  Father-in-law
FM  Foster mother
FSi Foster sister
GA  Great Aunt
GD  Granddaughter
GF  Grandfather
GGF Great-grandfather
GGM Great-grandmother
GGGF Great-great-grandfather
GGGM Great-great-grandmother
GM  Grandmother
GN  Grand nephew
GNi Grand niece
GS  Grandson
GU  Great Uncle
Hh  Hired hand
Hm  Hired man
I   Inmate
L   Lodger
m   Mother
ML  Mother-in-law
N   Nephew
Ni  Niece
Nu  Nurse
0      Officer
p      Patient
Pa     Partner (share common abode)
Pr     Prisoner
Pri    Principal
Pu     Pupil
R      Roomer
s      Son
SB     Step-brother
SBL    Step-brother-in-law
SD     Step-daughter
SDL    Step-daughter-in-law
Se     Servant
SF     Step-father
SFL    Step-father-in-law
Si     Sister
SiL    Sister-in-law
SL     Son-in-law
sm     Step-mother
SML    Step-mother-in-law
Ss     Step-son
ssi    Step-sister
SSIL   Step-sister-in-law
SSL    Step-son-in-law
Su     Superintendent
u      Uncle
w      Wife
Wa     Warden

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