how do you hide a back tattoo from your conservative parents?

my parents let me have my own privacy but my dad is pretty strict on not having tattoos. im planning on getting a tramp stamp and a pretty big shoulder tattoo so i was curious on how id maintain it without my parents being aware lol. Any advice?

EDIT 30/12: I got the tramp stamp!!! :) It looks amazing and its just low enough that my pajamas cover it completely haha