How to use "elder" in a sentence

Marius, depressed at what he saw, was going to get down from the cupboard when the door of the Jondrettes' room opened and the elder girl came in

'A fine job!' the elder girl called back

On top of the cupboard, by his feet, he noticed the piece of paper that the elder daughter had written on: Be careful! The police are coming!

He looked up and recognized Eponine, Thenardiers elder daughter

What would the elder Alexander's, the famous statesmen, think if they knew he'd soiled his hands with blood? As for the fact that it was sometimes his job to order other men to kill, he supposed his family would understand