A report in the journal Child Development notes that genes are a key factor in children's odds of developing conduct problems such as defiance, or being argumentative and generally uncooperative. But parental conflicts and overall upbringing play a role as well, so hereditary influences alone don't determine how a child will behave.
Parents and adults in general need to be careful about how they behave around children, and to make sure they demonstrate mature conflict resolution and appropriate behaviors when they don't necessarily agree with something. Kids need to know that in the end, we all need to get along with one another!

