Each to their own. I left my daughter overnight with my parents when she was 7 or 8 months old while we went on a city break which was given to us as a Xmas gift. I think going overseas is a completely different matter though. This kind of thing used to really bother me but I found after a couple of years that it wasnt productive or helpful to me to bitch and moan as it wasnt my child and if they thought it was okay, then so be it. I used to get very very frustrated though.....Basically I had a brother and a sister in my care for 2 1/2 years. The girl was 3 months when she came to me as mom couldnt take any more time off work as it was her business. The boy was nearly 2yrs. 4 weeks after the girls was born she went to cuba for a week and left both kids with her mother. 3 months after taking the kids on she went to cuba again for a week. During the rest of the time I cared for them she went to cuba 1 additional time for a week, Paris for 10 days and Chile for 2 weeks. Every time her kids were left behind with her mother. I can't begin to understand how a mother can want children and then leave her babies so frequently for extended periods of time and overseas no less. I think an occasional night or weekend away is almost essential for parents to keep their sanity and their identitiy beyond the role of mother or father. Unfortunatly a lot of us parents dont have friends or family who are either able to take over care for this or we just don't feel able to ask for it. I personally think without any knowledge obviously, that this friend has likely figured that while a honeymoon is important to them, a week away would be to long and the 4 day duration seems like a compromise. They clearly trust you without question to ask you to do this for them. So IMO, while I couldnt go overseas and truly feel comfortable not being in the same country as my kids, I dont think its a big deal if the childs parents and yourself are okay with it.