I've stuttered my whole life. It was hard. it's still hard, but face the fear. Im 24 and own a home renovation business. When my stutter is bad, I tell my clients that I have a stutter and the mood brightens up. Be upfront with your in-laws. It'll be ok, and the mood will change. I hate that we have to go through this, but the moment I decided not to be held down, I was set free. Good vibes are sent your way! I know how you feel. This reddit has really helped me not feel alone.