They have been to classes together , learning Karate first, and now yoga. She considers herself further along the yoga journey than him, but perhaps she is not. Perhaps there is much she can learn.. from him. One of the things she has striven is to not interfere with his learning in the class. So if he has been doing something incorrectly, having not paid attention to, or misconstrued the teacher, she has let the teacher correct him. This, because in her experience as a teacher she had found it really difficult to connect o the student, if the mother stood by shouting instructions while she tried to teach.
The Boy Yogi: Image credit http://www.wikihow.com/Be-a-Worthy-Teenage-Boy
Even so, occasionally, she would mouth at him, “Straighten your legs”, “Take a block” etc during the yoga classes. He would frown and shake his head at her, proceeding to ignore her, and the teacher, as they suggested that using a block to support those postures that needed it was a good idea. For was he not a strong and supple young man? He did not need the support that a weaker and lesser dude would need. He always attempted the most challenging option, the coolest variation, straining into the postures in his wobbly and curly fashion. She learnt to bite her tongue and allow the teacher to come to him and gently guide him to the level that he was rightly at. Most of the time.
Then one day, she noticed that he was taking a few breaks once in a while, curling down into Balasana when the flow was demanding just that much more energy than he had right then. He was pulling the block to him to support those asanas that he needed them for and when, in spite of herself she said “psst, straighten your head”, he did so, without a frown.
As she turned back to her own posture and her journey, she smiled in joyous realisation that as her journey had progressed in its own way, so had his. He seemed to now have a different measure of cool.
Adorablescents 
I think it is beautiful to see families practising together, but it brings an additional challenge to the practice. One should always bear in mind that the yoga practice is a journey inwards and this can be particularly difficult when practising with someone as close as father/mother with son/daughter. Even if it’s hard not to, to be focused on what another person is doing (no matter who that person is) is to completely miss the point. But the observance of our own faults and the gradual adoption of a different approach, letting go of our usual behaviour patterns, is a great demonstration of self-improvement. This is a beautiful post. Thank you.
Thank you Ana! You have very beautifully explained what I was trying to say! ❤