My sis... | has a problem

probably not as different as you think.

my mom says that she wouldn't like it if i got tattoos, and i don't, simply because they seem a little rediculous at times, and out of respect for her wishes.

obviously, if your sister went out and did it, when she knew that it was going to be an issue, there must be some gap between what is expected of her, and what she does, no?