Cousin as guardian for piercing?

I'm 17 and i wanna go in to get my nipples pierced. My mom would never agree to it so i was wondering if it'd be okay to bring in my 22 year old cousin to sign for me? Btw, this is at Atomic Tattoos in Tampa, FL
Update: The last time my mother took me there to pierce my septum all they asked for was her ID then told her to get the form notarized. There was no birth certificate involved.
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