I have a question as to whether or not future in laws are customarily invited to bachelor/bachelorette parties. My sister has offered to host my bachelorette party and asked for my input as to what I wanted to do. We quickly decided on camping. I happened to mention last night to my FI that my sister has asked for my list of people to start contacting and I know that my FI's bestman has also started to inquire about his list. My FI stated that he was going to invite both of our fathers and his grandfather (FI is golfing for his party). My mother lives out of the country so she is obviously not coming. Do I extend invitations to my FMIL and her mom (FI's grandmother)?