I read this somewhere in the last five years, albeit only the first few chapters. The protagonist (high school age, I think) lived with her younger sister, no parents for reasons I can't quite place. They both have powers. I think the older sister had some sort of death touch. I keep going back and forth about whether it sickened and killed them, or they died under more natural/accidental circumstances. Her younger sister, I think, had the ability to bring dead animals to life, maybe also people, with their pet actually having been resurrected. I think the death touch requires skin contact, which leads to the older girl being very antisocial and always wearing gloves. After an altercation in a parking lot with someone from the high school, she's approached by a boy her age who invites her to join his family, who all have preternatural powers. I don't think the powers are common in the population, and I think most people were unaware of them.
Unfortunately, I don't remember a ton about the other people in the house other than that it was headed up by an older gentleman and there were at least one boy and one girl already there, teenagers. I also don't remember anything about whether it was a paperback or a hardbook, or a cover (which makes me kind of wonder if I read this online, or via Kindle).