I had mine for about three weeks before I told my sister (who lived in a different country and had come back to visit) and we told my mum together. My mother was NOT happy - she made me promise not to get another one. I think it's a generational thing, she associates tattoos with crime and bad company in general.
I just dropped the bomb last night - she's still coming to terms with that. She keeps giving me the evil eye and rubbing her side (my tat is on my side) a lot and making disapproving noises. Oh well.