Following are all the step-parent like words, in the list below.
STEP-SIBLING
100% like step-parent
STEP-BROTHER
100% like step-parent
COPARENT
100% like step-parent
SIBLING IN LAW
100% like step-parent
FULL SIBLING
100% like step-parent
HALF-SIBLING
100% like step-parent
HALFSIBLING
100% like step-parent
GREATGRANDCHILD
100% like step-parent
GREAT GRANDPARENT
100% like step-parent
EXPARTNER
100% like step-parent
HALFSIB
100% like step-parent
EXHUSBAND
100% like step-parent
HALF SIB
100% like step-parent
EXWIFE
100% like step-parent
HALF-ORPHAN
100% like step-parent
ADOPTOR
100% like step-parent
GREAT GREAT GRANDPARENT
100% like step-parent
BIO-DAD
100% like step-parent
GREAT AUNT
100% like step-parent
LOVECHILD
100% like step-parent
GRAND UNCLE
100% like step-parent
GREATGRANDSON
100% like step-parent
GREAT GRANDFATHER
100% like step-parent
GREAT UNCLE
100% like step-parent
INHERITER
100% like step-parent
NONRELATIVE
100% like step-parent
SUPERCESSOR
100% like step-parent
GREAT GRANDCHILD
100% like step-parent
GRAND-UNCLE
100% like step-parent
SCHOOL TEACHER
100% like step-parent
NON-FRIEND
100% like step-parent
GOD-SIBLING
100% like step-parent
HOME-SCHOOLER
100% like step-parent
NEWLY-WED
100% like step-parent
GREAT GRANDMOTHER
100% like step-parent
FOSTERCARE
100% like step-parent
NONHETEROSEXUAL
100% like step-parent
SUBSTITUTER
100% like step-parent
NEWLY WED
100% like step-parent
HOME SCHOOLER
100% like step-parent
GRAND-AUNT
100% like step-parent
HYBRIDISER
100% like step-parent
PROTO-ANCESTOR
100% like step-parent
CO-TEACHER
100% like step-parent
EMPTY-NESTER
100% like step-parent
NON-PASSENGER
100% like step-parent
HALFBREED
100% like step-parent
PEDIATRIST
100% like step-parent
CO-SPONSOR
100% like step-parent
NON-PHYSICIAN
100% like step-parent
PEDOGAMY
100% like step-parent
CO-PATRON
100% like step-parent
PRE-MARRIAGE
100% like step-parent
EXFRIEND
100% like step-parent
NON-ACADEMIC
100% like step-parent
GREAT GREAT GRANDCHILD
100% like step-parent
GREAT GRANDSON
100% like step-parent
EX-PAT
100% like step-parent
TRANSPERSON
100% like step-parent
SUBSIDISER
100% like step-parent
PAEDOBAPTIST
100% like step-parent
TECNONYM
100% like step-parent
LOOK-ALIKE
100% like step-parent
COOWNER
100% like step-parent
PEDOBAPTISM
100% like step-parent
NONNATIVE
100% like step-parent
HIGHERUP
100% like step-parent
CO-MANAGER
100% like step-parent
NON-IDENTICAL
100% like step-parent
PATRONISER
100% like step-parent
POST-DOC
100% like step-parent
NON-EXECUTIVE
100% like step-parent
SOCIALISER
100% like step-parent
SUB-TENANT
100% like step-parent
SOCIALISEE
100% like step-parent
NON-PROFESSIONAL
100% like step-parent
SUBJUDGE
100% like step-parent
ADAPTOR
100% like step-parent
CO-DIRECTOR
100% like step-parent
MARGINALISER
100% like step-parent
NONLAWYER
100% like step-parent
HEAD TEACHER
100% like step-parent
LAST-BORN
100% like step-parent
IMPROVISOR
100% like step-parent
METIF
100% like step-parent
SUBSTILE
100% like step-parent
CISPERSON
100% like step-parent
STYLISER
100% like step-parent
AGEMATE
100% like step-parent
NON-WHITE
100% like step-parent
NON-PARTY
100% like step-parent
LéGITIME
100% like step-parent
CO-ORDINATOR
100% like step-parent
NON-SPECIALIST
100% like step-parent
CODEPENDENT
100% like step-parent
SUPER-SELF
100% like step-parent
NONPREREQUISITE
100% like step-parent
GRANDAME
100% like step-parent
APPENAGE
100% like step-parent
SEMIDEPONENT
100% like step-parent