What do you keep silent/hidden/secret for the 'sake of the family'?

Just read a couple of stories of lesbian women in heterosexual marriages that are not planning to come out because they want to keep their family intact (the hubby and children) and because they do not want to hurt anyone. Sounds reasonable, I guess since many people keep a lot of their truths silent or hidden for the very same reason. I know my mother did not leave my father ‘for the sake of the family.’ I never told the rest of my family that I’m queer or gender non-conforming for ‘the sake of the family.’ My best friend’s family (beyond his parents) does not know that he and his brother are gay for ‘the sake of the family.’

What do you keep silent/secret/hidden for yours?