You are his loving little sister, he always was so caring with you, a bit like he was with your other brother, but the family always knew you were his favorite and there was no problem with that

After the death of your Pa, he was there to take care of you, your little brother and your Ma (even being so young). When your Ma married another guys that was an idiot, he was there to protect and take care of the family. You were there for him every night it was hard, every night he cried because of Pa's death, because of the nightmares, because of how tired he was from the exhaustive work... you were there to consolate him and hug him until he would sleep

After Joseph, the little brother of you both died from tuberculosis, he was there to keep the family alive with the rest of the strengh he had. Weeks after, your Ma got tuberculosis and died too, and now is just you two against the world; he raises you, take care of you, give you a roof, give you food and the maximum of education and presents he is able to give you, which is not too much, and you stay there take care of him too when he forgets to take care of his health, you hug him in the nights that his nightmares about your dead parents and brother come and you both try to survive in this rough scenario

Billy arrived from work dirty of dust and clearly exhausted, he practically falls on the chair in the kitchen and sigh