My FMIL (who I love) invited someone to my shower who wasn't invited to the wedding (MOH hosted the shower...FMIL thought she was being helpful by invititing) the person she invited is an in-law of an in-law by best description....not a person that is important to my FI and I...FMIL just thought since she is at some family gatherings (involving the other side of the fam) that it made sense to invite her to the shower....Should I at this point invite this person or let it go or what?Please spare me any lectures on how this could have been avoided...it was an honest mistake by FMIL...I had reviewed the guest list with MOH to ensure no such faux pas, but FMIL isn't super versed on formal etiquette and meant well......