Blade and a Pansy (2p Italy Brothers Backstory)

All the 2ps are pretty dark, but none more so than the leader amongst them, Luciano de Luca. However, his brother, dear Flavio de Luca, didn't turn out so horribly. How did Flavio become so charmingly flamboyant while Luciano became so...crotchety and abrasive? Maybe a blast from the past will help organize some answers.