Answer:

REL

AnswerCrossword Clue
RELBro. or sis.
RELFam. member
RELFamily mbr.
RELShinto, e.g.: Abbr.
RELShort in-law
RELShort member of the family?
RELBro or sis
RELMother-in-law, e.g.: Abbr.
RELSeminary subj.
REL"Moral ..." (Adult Swim show)
RELMember of the family: Abbr.
RELMeth. or Luth.
RELFamily mem.
RELElectrical unit
RELTheologian's subj.
RELCath. or Prot.
RELFaith (abbr.)
RELPron. type
RELProt. or Cath.
RELSis or bro
RELTheol. belief
RELCivil War monogram
RELSem. study
RELFaith: Abbr.
RELHoliday visitor: Abbr.
RELCath. or Luth.
RELHol. visitor
RELBible subj.
RELBuddhism, e.g.: Abbr.
RELFam. reunion attendee
RELAunt or uncle: Abbr.
RELPop, for one: Abbr.
RELKin: Abbr.
RELMember of the fam.
RELDivinity school subj.
RELSem. subject
RELXmas visitor, say
RELConfed. monogram
RELDenom.
RELFam. tree entry