I highly suggest you have your son read the Wiki on SR shaving first. Getting the shaving DVD from Straight Razor Designs and you two sit down watch it together is also a good idea.
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I feel your pain, I am getting ready to move soon, and I will not have the access to my children that I have now. I know what you mean about "don't get me started" (I lived in Casorate Primo, Pavia, Italy - not too far from Milano for a while, I know the games a little too well; going to be going through them again in a little while).
I cannot wait to show my son, he will be taking an interest soon (he is a mini-me .... well I am 5'8" and he is 5'10"). If he takes to this I will get him better quality stuff than I am having delivered.
Seems like to teach the straight first will make him an expert quickly. Like learning a new language, some things are best learned young. I imagine he will be out-shaving you within a year and then teaching you proper technique.
I taught my 21 year old to use a straight a few months ago. Like me, he likes 'old' things and has used the straight I gave him (an Emil Kronenberg Sen) from then on. I told him about this forum but he hasn't checked it out yet, so he's only had the one lesson from me, and he seems to do just fine. As I said in another thread, I just need to get him to buy a bloody strop (he uses his belt)!
I felt very 'fatherly' teaching him this skill, and I often give him creams when they're almost finished for him to try. I also taught him to hone.