The second day of Diwali is called Naraka Chaturdasi. It is the fourteenth lunar day of the dark fortnight of the month of Kartika and the eve of Diwali. On this day, Lord Krishna destroyed the demon Narakasura and liberated the 16,000 princesses which the demon held captive.
On this day, it is said one should clear all misunderstandings and through inner cleansing remove anger, bad feelings, jealousy, etc out of the body to approach things with zero negativity. This will strengthen bonds between family members and a house without misunderstandings and negativities will flourish forever!