AD,
Great to meet you. I empathize with your situation. It sounds like you have a wonderful family. I can appreciate your inlaws and their interest in trying to encourage you. It is with love that they are acting, and that's obvious to me. Even though they may be wrong, and unreasonable, they are motivated by love, and it seems like you appreciate that.
You have quite a row to hoe. I was raised as a Witness, and have been out for just a few years. I'm still deprogramming.
Keep prayerful, and remember we don't stand as a group before God, we stand as individuals. You have to do what's best for you and your family.
I wish you all of the best, and Welcome!