[comprehensive] my family

Protagonist A has a selfish mother, supporting role B has a flirtatious father, cannon fodder C has a femme fatale brother, passer-by D has a duplicity older sister, and villain E has a hypocritical younger brother. Some of them promoted the development of the story, some made the former completely changed, and some completely delayed... But one day, they were still them, and they were still them, but the 'cores' were all changed...