Will I need a photo ID or proof of age to travel Greyhound?

In a few days I m traveling with my sister, who s 20, on greyhound. By their rules, I technically count as a child since I m 16. I don t think I have photo ID and my mom seems to have lost my birth certificate. On their website it claims that anyone picking up a ticket will need to use a photo ID, which my sister... show more In a few days I m traveling with my sister, who s 20, on greyhound. By their rules, I technically count as a child since I m 16. I don t think I have photo ID and my mom seems to have lost my birth certificate. On their website it claims that anyone picking up a ticket will need to use a photo ID, which my sister has, but I don t. Is that enough since she s an adult with ID? Or will I need to prove I m 16 and am the person the ticket belongs to?
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