Michael is deeply troubled by Vincent's impulsiveness and fiery temper, but even more so by his romance with Michael's daughter Mary; he fears that Vincent's growing involvement in the "family business" will put her in danger.
Michael is deeply troubled by Vincent's impulsiveness and fiery temper (inherited from his father), but even moreso by his romance with Michael's daughter Mary. Remembering how he lost Apollonia over 30 years earlier, Michael fears Vincent's growing involvement in the "family business" will put Mary in danger.