I know there are conflicting views on certain issues relating to following a local custom vs. one's family custom. However, what are the general concepts that are applied in determining the Halachah?
It should seem that the straightforward Halachah is that if someone moves to a new location that has a different Minhag than the Minhag with which one was raised, one automatically needs to conform. Yet, in matters ranging from Tefillah to public mourning to Yom Tov Sheini (in or out of Israel), there are conflicting practices within the same community.
What are the rules - or maybe the circumstances - that need to be weighed?
Some variables that might need to be considered (or might not, I don't know):
- Visiting students (which can be subdivided into short-term, medium-term, and long-term, and can further be subdivided into other categories)
- Official-ness of local Minhag
- Majority observance of local Minhag (or not)
- Type of Minhag