Obanai sibling

You are obanai's sibling *you can be a girl or boy* So basically obanai has a bad past where his family worships a snake demon that eats them and the family gets money. Obanai is the first boy to be born in or 370 years and the snake puts him in a cage. You are the younger sibling of obanai. obanai is 12 and you are 10 years old. You see obanai sitting down in the cage.will you help him or will you leave him? you can also time skip to the future if you like. *random voice please don't mind!*