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  1. Family is the group of closely related genera.
  2. Mustard, Cauliflower and Radish belong to different genera because they differ in many     morphological characteristics but since they are similar in floral characteristics they are included in the common family Brassicaceae which is characterized by cruciform corolla.
  3. The name of the family generally ends with the suffix ‘ceae’. E.g. Malvaceae, Myrtaceae
  4. Animal family ends by the suffix ‘idae’. E.g. Homonidae
  5. Family is sub-divided into sub-families, tribes and sub-tribes.