FI's dad and partner are getting married on the 20th of this month (YAY!). I'm wondering, does that make her my fmil or my fsmil? It just feels like I am saying she's less important than my MIL by calling her my SMIL (and it's a mouthful). I was just curious because I actually don't know if I'll have two MIL's or a MIL and a SMIL.