A.C.
Dear Defiant behavior:
I have a 7 year old daughter who seems to be going thru the same thing. I have learned to teach them respect along with discipline.
Remind the 14 year old how would he like to be treated and to remind him that respect is earned not given. If it continues you could start taking away privileges. I have done this with my 7 year old and she gets one warning. After that she loses her tv, phone time, story time and dessert time for the night. If she continues after the warning has been given and punishment has been given then she loses for another night until she gets the message.
I realize that 14 is a lot different then 7, but I am telling you this truly does work and I stick to my guns. We all worry about making a child unhappy, but in the end they will respect us for it.
Good luck.
A.