Definitions/Explanation:
Family: 

Explanation

Family, has a group of related genera with still less number of similarities as compared to genus and species.
Families are characterised on the bases of both vegetative and reproductive features of plant species.
Among plants for example, three different genera Solanum, Petunia and Datura are placed in the family Solanaceae.
Among animals for example, genus Panthera, comprising lion, tiger, leopard is put along with genus, Felis (cats) in the family Felidae.
If we observe the features of a cat and a dog we will find some similarities and some differences as well.
They are separated into two different families - Felidae and Canidae, respectively.