Want to adopt my sister and brother

I think it all depends on where you live and how the situation is. Like I have heard that a wife and husband adopted one of their siblings after both parents had died. So I think the best situation is talk with a lawyer. :)

I know someone who lost both parents and their legal guardians. She lived with a friend fighting the courts until her brother was 18, then he adopted her. So if your over 18, as I'm sure you are, you can probably adopt them...but if your parents are still alive it might be difficult.