[INST] Construct a family tree based on the given names./nJohn, Martha, William, Robert [/INST]  ###Response: It is not possible to construct an accurate family tree based on just the names given without any further information or context about their relationships or familial connections. A family tree requires information on how each family member is related to one another, whether it is by parent-child, spousal or sibling relationship in order to form an accurate representation of the family dynamics.