Is conduct disorder hereditary?

Yes. It is heretiable in a few ways, modeling, watching parents results in similar behavior, impulse control has heretible components, and if a child's needs are not met by his caregivers, he will not develop empathy, only survival strategies and tend to violate the rights of others-the hallmark of conduct disorder.
Depends. Conduct disorder is not a condition so much as a description of a cluster of symptoms of inappropriate behaviors occurring in other conditions. People with bipolar disorder, generalized anxiety disorder, depression and ad/hd have a high incidence of conduct problems. The primary conditions are all heritable. Treatment of the primary problem usually helps the conduct problem.