Leur or leurs?

-"Leur" is used when the possesed object/person is singular, but the posessor is plural.
example 1: Leur amie est belle. "Their friend is beautiful"            (possesed=friend, singular; possesor=they, plural)
-"Leurs" is used when both the possesed object/person and the posessor are plural.
example 2: Leurs amies sont belles. "Their friends are beautiful"
(possesed=friends, plural; posessor=they, plural)