My parents were definitely not enthusiastic about me getting tattooed at first and would slip an "advice" on how it might negatively affect my life here and there, but they were never harsh about it and kept cool I guess. They don't have to like it but I always thought I owe it to them to explain why I do it and how I feel about the effects it may or may not have on my life. I make it a point to always tell them before getting tattooed and occasionally talk about tattoos or about my future tattoo plans so that even if they won't like it, at least they'll get used to it.
But as time went by (and not a long time at all tbh) they've become much more positive about it and both told me that they now see tattoos in a very different way and realize that even "good guys" get tattooed. My dad even told me that he's happy that I "know what I like and have the confidence to pursue it no matter what people think".
I can't say the same about my aunts/uncles and grandparents, but everyone is treating me positively as always so far, so I guess I can't complain...:)