- SIB
- Bro or sis
- Bro, generically
- Sis, e.g.
- Member of the fam
- Bro, e.g.
- See 10 Down
- Twin, e.g.
- Auntie, to mom
- Family vacay attendee
- First bedroom sharer, for short
- Room sharer, for short
- Thanksgiving dinner guest, for short
- Bunk sharer
- Rel.
- Hand-me-down recipient, briefly
- Bro, perhaps
- Bro, maybe
- One of the kin
- Twin, perhaps
- Room sharer
- Kinsman
- Brother or sister
- Object of a certain rivalry, for short
- Little sister?
- Backseat sharer, maybe
- See 61-Down
- Luke, to Leia
- Bro, for one
- 26-Across, for one
- Michael or Janet, to Tito or La Toya
- Michael, to Janet or La Toya
- Sis, say
- Relative, briefly
- Rival of a sort
- Sis or bro
- Lisa to Bart, or Bart to Lisa
- Family member
- Unc, to Pop
- Close kin
- Close kin, for short
- Likely bunk bed partner, briefly
- Close relative, for short
- Charlie, to Emilio, briefly
- Bunk bed sharer, often
- Bro to sis
- Close relation
- Short relative?
- One of the fam
- Dakota, to Elle
- Jacob, to Esau, for short
- One of a quint's four
- Meg, to Jo
- Unc, to Dad
- Bro, to a sis
- Family vacay participant
- Bro, say
- Sis, to her sis
- Part of the 56-Across
- Jem, to Scout Finch
- Twin, say
- Part of the fam
- First roomie, for some
- Relative
- Sis, to bro
- Roommate, perhaps
- Brother, for one
- Certain relation
- Brother or sister, for short
- Quad, to another quad
- First roomie, often
- Sister or brother, for short
- Family member, for short
- Clipped kin
- Roommate, often
- Quad, e.g.
- Only child's lack
- Related by blood.
- Kindred.
- Blood relation.
- What 44 Down is.
- Brother.
- Blood relative.
- Close relative.
- Sister or brother.
- Akin.
- Cain or Abel, for short
- Kin
- Kin, for short
- Andrew, to Charles
- Close kinsman
- Blood brother, e.g.
- One of the family
- Rival, perhaps
- One in the family
- 12- or 62-Down
- Close relative, briefly
- Brief connection?
- Household member, for short
- Person in a tree, briefly
- Room sharer, often
- Many a recipient of hand-me-downs, informally
- Close relation, informally
- Fam. member
- Twin or triplet
- Twin or quadruplet, for short
- Possible recipient of hand-me-downs, informally
- Sis, for example
- Twin, to the other twin
- Kim to Kourtney, or Kourtney to Khloé
- One you might squabble with in the back seat
- One sharing a bunk bed, briefly
- Fam figure
- 120-Down, for one
- Li'l bro, say
- Sis, maybe
- Twinsie, e.g.
- Womb mate, maybe
- Big or li'l one
- Family reunion attendee
- Bro's bro
- Blood relative, briefly
- Bro to bro
- Hand-me-down source, for short
- 18-Down, for one
- Little sister or brother?
- Eng to Chang for short
- Family mem.
- Brother e.g.
- Bro
- Family relative
- Blood relation, briefly
- Close kin, slangily
- One of the kin (Abbr.)
- Quint, to another quint
- Bro or sis, e.g.
- Bro or sis, for short
- Big sis, for example
- Little sis, for example
- Li'l sis, for example
- Big bro, e.g.
- Household rival, often
- ****
- Kid's roomie, often
- Frequent rival, for short
- Many a "Brady Bunch" character
- Bro or 26-Across, informally
