TV series example of the word

Game of Thrones Season 2, Episode 2
Your sister took over command of your eldest brother's ship

Game of Thrones Season 1, Episode 8
Little dove, you must write to Lady Catelyn and your brother, the eldest,

Game of Thrones Season 5, Episode 3
You're Sansa Stark, eldest surviving child of Ned and Catelyn Stark.

Game of Thrones Season 5, Episode 7
I'm Lord Bolton's eldest son.

Game of Thrones Season 5, Episode 2
Our eldest child murdered at his own wedding.