How was Kidou's life in the past?

at first his life was kinda sad and he missed his sis haruna his parents died in plane crash he was adopted door someone else and his sis was adopted door some one else they were apart and they didnt see each other of even didnt stay in touch after that he zei if i win three consecitive FF than judes step father will also adopt haruna but after the match with raimon he gotconvinced door his sister that she was happy with hwr step family and then he joined raimon and became happy