Parents not excited

I dont know your parents status, but there could be something going on that they haven't spoken with you about. I am only guessing here, so please dont take it to heart or think I'm being hurtful, but sometimes, parents dont let their kids know bad stuff. (Money issues, health, relationship problems) things like that. Not sure how close you are, but try having a chat to see what's going on, if anything. Tell them you love them and that as an adult, youd like to know. Take it from there.

Some people don't show their excitement the same way that others do. Maybe your parents aren't big into the idea of weddings and it serves as a means to an end, ie the wedding serves as a ceremony for getting married. My mom is excited for my wedding, but to others, she definitely doesn't look excited. It is really hard to not have your close family excited for your wedding, but it sounds like your FMIL is showing enough enthusiasm for her and your mom. Enjoy this time with your FMIL and use the time to bond with her.

I would guess that your Mother doesn't agree with your choice. I can relate, and have acted in a similar manner.