Kumo Ichizoku to Doro Girl

Synopsis

Although she was adopted, Suzume took care of her younger siblings even without their mother. When their father passed away, too, the kids were taken in by their rich relatives the Nanami clan. But Suzume was coldly informed that they only cared about the kids related by blood, and the adopted Suzume is no longer welcome as part of the family. She can only stay on as a "pet"?