maybe asking how they can help me or asking if they can go into service with me
You can deflect anything like that politely: "that's a very kind offer, brother, but I feel at this time that I'm not really in a position to do that... I feel that I need to study this and pray to Jehovah for guidance..." The key is to always be kind, polite, humble, and grateful for the help and support they provide.
Unfortunately, for the big questions: ("Do you still believe in the FDS", etc.) you have to practice saying "Of course!!" with wide eyes like you're surprised that anybody could even think that.
It does feel ugly and wrong to play that game, but you're going to have to sacrifice a small part of your integrity to keep your family.