Eph 6:4 And you, fathers, do not provoke your children to wrath, but bring them up in the training and admonition of the Lord.
The admonition here is for both fathers and mothers. Paul may be singling out fathers because mothers are wired as nurturers and diffusers of conflicts. Fathers on the other hand can sometimes irritate through loss of temper and violence in reproving or through unreasonable commands.
Paul having already spoken to the children about their duty, it is important that he advices fathers to be careful how they deal with this expectation from children knowing that we are all sinful and need grace.
Parents must first train but with patience. Research suggests that most human brains take about 25 years to develop, though these rates can vary. In teen’s brains, the connections between the emotional part of the brain and the decision-making center are still developing, God set it that way. And because we live in a result oriented world, people want things here and now, and because biblical principles require patience, many have opted to the spirit of the age. The spirit of the age is a set of ideas, beliefs, and aims that is typical of people in a particular period in history. The spirit of the age wants to overturn biblical worldview and principles. Parents must train and admonish in the ways of God, that is discipleship, that is their job.