Core php family tree

The php website that is written already has profiles.. so need to build a family tree module where these users (individual Profiles) can add father, mother, siblings, children, spouse to their tree and others can view the tree structure. if a user adds a father and father has added a father or mother in the tree it must appear as user's grandfather and or grandmother...same with user's mother viewing options like in the beginning when the tree is clicked current generation can be seen when clicked see past generation...past generations like father's father must appear or mother's father as added