Antonio doesn't usually go out of his way to raid houses on land (he prefers attacking ships on the sea where he's less likely to get caught), but if Lili's family had something that he really wanted, or if he had some grudge against her parents for some reason or another, he might break into their home. Attacking the whole village would probably be a little too ambitious for him. He doesn't have *that* many men, and the chances of getting caught would be too high to make it worth it unless Lili's village was really small and unprotected. Even then, Toni would prefer a sneakier approach.
So in short, I think the best way would be if Antonio tried to sneak in to Lili's house to get something valuable that he'd been searching for and was caught by her parents, who attacked him. Toni wouldn't hesitate to kill them if they got in the way of the treasure he came all that way for. He probably wouldn't kill Lili's mom on purpose because he's nicer to women, but maybe as an accident or self defense...
Let me know if you have any other ideas.