An extended family is a type of family that consists of the father, mother, children and other relatives living in the same household. It goes beyond consisting of just father, mother and children.
The family above consist of the father, mother, children and a grandparent, which makes it a type of extended family. It goes beyond a typical nuclear setting of a family.
Well scientists will be able to study organisms more efficiently, and they will be able to organize them into groups based on their cell structure, behavior, habitat, similarity, and more.