I would recommend really trying to go down the road less traveled and involve and surround yourself with people who get things done,not get in your way. If you choose to include your FMIL just for inclusion sake, that is totally your choice but know it comes with lots of confusion and stress. I had similar situations and I bascially told my mIL and SIL (future at the time) that I had everything under control and if I needed their help I would let them know. ANd guess wht--they had to be fine with that. At the end of the day, I let my in-laws know that unless you are paying for something, your "strong" input is not really necessary. We preferred to not accept anything because then the demand list would be notoriously lengthy.