I vote that you and dad discuss the permanance of the tattoo with him, ensure he picks a design that he loves, take him to a place that is clean, sanitary and has a good reputation. Then talk with the artist, discuss all the details and let him make the final decision.

I'm 41 years old, I want to have paw prints for each of my RB animals tattooed on my right shoulder walking down my back (away from me). One paw print for each missing furbaby. This has serious and significant meaning for me and will one day become reality.