In that day and age it was not uncommon for wealthy extended families to travel together to other homes for a season. I’m not sure splitting up to travel would have even been a consideration. Plus, it is not like there were a multitude of transportation options.
As for Lamar Longstreet, I was ambivalent. There was seemingly never any accountability on his part for the lives lost which was unfortunate. And true, while it was an accident, there appeared to be no thought given to safety in such foreseeable situations - negligent. Yet, at the same time, I felt sorry for Lamar given the personal loss of his loved ones.