Should I allow my son to get a lower back tattoo?

My son, who is now 17, has recently decide to get a tattoo. Growing up, I always told him it's his choice, since both his mother and I have them. My biggest concern now, is that he likes his mothers most prominent tattoo, the tribal rose design on her lower back. I have tried to shy him away from this, but am... show more My son, who is now 17, has recently decide to get a tattoo. Growing up, I always told him it's his choice, since both his mother and I have them. My biggest concern now, is that he likes his mothers most prominent tattoo, the tribal rose design on her lower back. I have tried to shy him away from this, but am not having all that good of luck. I must sign for him, since he is under 18, so that is my only safety net here. However, he turns 18 in about 6 months, so what do I do? His mother is of no help and ran off with another man about 2 years ago.
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