I haven't had much need to consider man's law, except as a rough (and potentially hostile) guide. My youngest son just didn't want to drive, for instance. My older son waited too. I eventually taught him how to ride a motorcycle first and then to drive. The subject of "I'm 18 now, I can do what I want," spoken in opposition, was seldom (I can't remember it), if ever, brought up.
What I do remember is being much in prayer (because the job of being a single dad was too much for me). There was a time when they were young when they were asked to look at their friends and how they got along with their parents. After they came back to me, I asked them to speak to their friends and find out how they knew that their parents loved them. Some stories about abusive relationships were told, other stories about healthier relationships were discussed. This led us toward the subject of discipline as an expression of caring. The twenty years and more of our family times and trials and blessing is more than I can relay. For the most part, there was no breaking, no stopping or discontinuance of the care that united our hearts together and so well during those times.
I distinctly hear echoes of the last verses of the Old Testament when I consider relationships between fathers and sons (children) these days. Malachi 4:5-6