Maybe start with almost a buzz? Do the back and sides off short, but leave some on the top. Once they get used to that, go all the way.
Get a couple nice hats, that you will wear when you are out and about with them.
Explain how money will be saved on shampoo, and the drains will be less apt to get clogged.
Take up motorcycle riding, and explain how much more comfortable short hair is when wearing a helmet. They do want you should wear a helmet, yes?
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