The Gluecks identified a number of personal and social factors related to persistent offending. The most important of those factors was family relations. What were the terms considered in the family relations

The quality of discipline and emotional ties with parents.

Explanation:

Their findings further suggested that adolescent raised in a large, single parent family of limited economics means and educational achievement were vulnerable to delinquency. The Gluecks' research integrated biological, social and psychological elements; and suggested that the initiation and continuity of a criminal career was due to developmental process influenced by both internal and external situations, conditions and circumstances.