The only withholding of the truth that I've been through was when my sisterthebitch insisted that I never tell Mom and Dad that I'm gay. She insisted that they would hate me for it, and for a long time I fell for that line.
It later turned out that she was trying to make my being gay a wedge issue between myself and Dad, I firmly believe because she was always bitter that I was born a boy, and therefor priviledged over her as a girl even though she was the older sib. Gender always has been a bugaboo for her - I hate to think what would have happened if her only child hadn't been a girl.
In any case, Dad has no real problems with my being gay, and is great friends with der B. But that wedge caused some real communications problems between us for years. And, given that we Whites usually have long lives (Dad is in his upper eighties, but acts twenty years younger), there's going to be a grudge going on between myself and Sis for quite a long time because of this.
*sigh*