how do you continue as an elder? You certainly are not misled and I understand the family situation, but how can you continue as an elder knowing what you know?
You heard of the French Resistance during WWII, right? Though occupied by the Nazis, many French continued their daily lives, making a show of obeying their new rulers, while behind the scenes working with the Allies to disrupt anything Nazi related. Some were armed and ready to fight, while others were more of an underground press, distributing news and creating passage for people to escape the Nazis.
While up front guerrilla warfare is pointless with the WTS, an underground free press, so to speak, as provider of accurate information about the enemy, can help people tunnel their way free of the oppressors. Even if it's only to free your immediate family, it may well be worth the effort to stay underground, working against the WTS' efforts to rule your family.