The possessive with s

The possessive with s
• To indicate possession for people or animals:
  a) in the singular, add 's:
    Budi's bike
    Ucup's friend
    The dog's food
b) for plurals ending in s, just add ':
    The boys' mother
    My parents' house
    The ladies' hats
c) for other plurals, add 's:
   The children's friends
   The women's cars
   Note: It's = It is. The possessive of it is its:
   It's cold today.