I actually have a job that I frequently face that dilemma. I have numerous times told people who were above me "No" and clearly stand my ground when it was expedient to do otherwise. And it's easy when it's not your sister, cousin, aunt, mother or other familial relation and your welfare is at stake.Yeah, it's cost me at least one job and maybe a second. But when they went ahead and things unraveled, my conscience was clear. But what is unfortunate is that is a human being for which you are responsible that pays the cost for the expediency.
insisting that taking a stand is easy, or proper, or even correct is a very first world perspective and does not account for a lot of the realities people in this world face. And when things unravel....well the legal system is not the same in many places as it is in the US....some places litigation is not an issue.
-Z