I'm going to offer no opinion on this beyond saying that I couldn't do it personally.
I spoke to someone today whose one year old child spent 4 months with her grandparents, overseas. I was because it seems incredible that someone could do that. AFAIK there was no underlying reason - all parties were happy with the arrangement.
Was IBU to be flabberghasted? If everyone's happy then fair enough, but it's a bit, er, unusual, isn't it?
I didn't pass comment on it - none of my business obviously - but I did wonder what MN's take was.