My wife misses her father and my daugher do the same!!

Maybe when you send your wife next time you can take a couple days vacation and join them for a couple of days. But fear not the 2 year old will grow out of this. Does your daughter sit and cry the whole time or what makes her sick. I use to get homesick as a child when I would go off to camp for a week or if my mom and dad went on a vacation and left me with family or friend but I never got ill. But like I said if you can afford to take a couple of days to join them if even in the middle of their stay or toward the end so you all can come home together may help. Or you can just let it go because she'll out grow it in time.