Join Date: May 2004
Location: formerly Gold now Diamond, formerly MSY, now LAX, formerly NW, now DL
Programs: Hyatt Plat, Hilton Gold, SPG Gold, Delta Diamond/1MM
Posts: 4,736
You can only change the date for the return you can't cancel it and get a refund. The change fee ($50 i beleive) would be charged unless you are PE. So either your mother in law flies the second half now or later (within a year I believe) or you lose the miles...