After being rejected by his Italo-American mafioso father, a mixed race lawyer decides to exact revenge by building his own criminal empire and destroying his father’s.

That makes a lot more sense. But did his mother die? I would specify that.

'When the illegitimate son of a Mafia don learns that his estranged father ordered the hit that killed his mother, he builds his own criminal empire to destroy his father.'

Latest version that explains more of the protagonist's motive.

When the illegitimate son of a Mafia don learns that years ago his estranged father ordered the hit on his mother, he builds his own criminal empire to destroy his father.

Could you give my log line a once over? I have been given several suggestions, but I am not sure which one to either pick or to cut and paste together. Thank you.