I want to serve Jehovah but I feel that the people make it so hard
but don't you know, you can serve Jehovah. Jehovah is another name for God, and it's up to you to keep love in your heart for who God really is; Love. Maybe their Jehovah really isn't God. Maybe the best thing for you and your wife to do is to serve God by being the best people you can be, praying regularly, and thanking Him for all the things He has provided and created, and the goodness that He is. JW is just a bunch of men, it's a cult, it really has nothing to do with God himself, and I think that you know that (especially if you're here). It's the PEOPLE who make up the Organization, but it isn't God (even if they try to claim the Faithful and Discreet Slave is directly influenced by God... we all know that's bull).
I know exactly how you feel, because I've been there... I am there, we all are in some capacity. I have family members who haven't spoken to me in 20 years, but write stupid letters, not unlike the one your MIL wrote to you. Next time you get a letter, do what I did... rip it up, and throw it away. It will break your heart to do it, and you will feel the tinge of guilt, but your heart will heal once you realize that God (Jehovah) would never want families to shun one another. That's an idea that has been put forth by men!!!
Just remember, we all got your back!