Brother, sister

Words related to siblings.

• What words refer to the children of your father and mother?
  sibling brother sister
• What words indicate the order in which your brothers and sisters were born?
  elder brother elder sister younger brother younger sister
• What words refer to the children of your father by another mother, or of your mother by another father?
  half-brother half-sister
• When your father or mother marries a person who already has children by a previous marriage, what words refer to those children?
  stepbrother stepsister