My future husband and I have sort of a different parental set up for our wedding. My FI's mother passed away when he was just 8 months, then his father got remarried when he was about 2. This Stepmother(SM) barely raised him, meaning she worked all the time and left the raising to his father's mother. This SM is VERY unsocial and is horrible to try to get her to do things if its not with her own family. If I try to invite her to things, she initially says yes then backs out the day before. How can I honor my FI's birth mother without making the SM angry? I couldn't careless about pissing off the SM but I want to have the birth mother be apart of our day in some way. Please give any advice with this and dealing with evil MIL....