I have heard that even if your “family minhag” is to eat inside, this is a minhag ta’us and you should eat in the sukka.
I have heard the same. This seems to be the classic litvish approach.
I have heard that the whole reason for the chasidim not eating in the sukka on Sh”A is that in Europe it was freezing cold
Yes, Aruch Hashulchan.
Nice to see you chofetzchaim!