I would've had my people do a better job of setting the bomb up and be absolutely sure his family was somewhere else. Or, I would've just sent someone to spy on the guy and just murder him outside at night when hes alone. Once he saw the kids in the car, Tony had no idea of what to do, he was so angry that the plan had not worked out the right way, that he killed Alberto to stop him from killing innocent children and women. And from that point on, everything went down hill. He knew Elvira wasnt coming back, Manny wasnt watching over everything in Miami, Sosa was pissed, Gina was missing, he then finds Manny and Gina together married. And all of this happened in less than 24 hours, he lost it, and then went to the coke which didnt help much either. If the whole assassination had been planned better, Tony Montana would still be alive today!