[Jose] 'son, [Milton], aced his math class and made his father proud. [Pat] took his sister [Irene] too the zoo but his sister [Arlene] could n't come because she had to work. [Milton] took his daughter [Irene] to the park that afternoon to play. [Margaretta], who is the sister of [Arlene], is a lovely girl.
('Jose', 'Margaretta')
This example is uncle.