I think you want to separate your own code of hunting from your expectations for others. Don't try to impose your hunting code on others. You can discuss it with them, you can provide your rationale for your code to them if they want to hear about it or you care to disclose it to them. But I think you are bound for trouble if you try to impose your code on others, particularly other family members. This advice holds for other things than hunting codes also, such as politics.

I happen to sympathize and agree with your opinion that shooting deer over a food plot from the porch isn't hunting, but I and you are not designated to be the dictators of hunting behavior. And I don't think it is worth spoiling relationships with fathers or brothers about. Be content and happy in your own hunting methods.

Maybe your father is just trying to build your younger brothers's self-confidence or self-concept up? People change with age. If you plant the seed in your brother's heads now that there may be a more challenging, sporting way to hunt deer, maybe when they are older they will rise to the challenge and adopt your methods?