because the curse that his wife will always die and he can’r have any siblings yalllllllld bdhshwhsh. also i’v gotten to this point in this story when i only started reading it last night. this story is so good help
"Adopting you as my sister." He answered with a straight face, making the side of her lips twitch. "I am thinking of adopting you as my sister. Unless you want to be my adoptive daughter, I do not mind, honestly."