Fjodin, let me amplify that idea of multiple generations at bit. You could outline for yourself a set of rival English families, both aristocrats and non-aristocrats, perhaps from a certain county such as Cornwall or Devon (good sources for pirates and privateers), whose rivalries go back as far in time as you like. You wouldn't even need to figure out how far back you would want to go, as you could always add a prequel here and a sequel there to keep stretching it further before and after 1700.
Buildings wouldn't need to change much. You could use some of the same buildings for a town in the south of England as are used in someplace like Jamaica, with the same look over decades. The same is true with some Spanish towns that your rival English factions raid.
The Tudor period, with it's developing religious conflict, and with the sea dogs like Drake and Hawkins could provide one early episode or period of conflict. The Foundry Sea Dogs are good figures for that. The establishment and loss to Spain of the wierd puritanical English pirating community of Old Providence in the Carribean in the early 1600's could be another episode of conflict. The English Civil War, Cromwell's dictatorship, and the Restoration is another great period for a conflict between rival English families. And figures are widely available for that from several makers. The Monmouth Rebellion and Glorious Revolution are also great backdrops to a conflict between rival seafaring English families. That was used as a jumping off point by the recent Robinson Crusoe series. And there was a lot of political conflict in the times of William and Mary, and later of Queen Anne, between Tories and Whigs and with the Churchills (Marlborough).
Basically, all this leads up to that classic Hollywood pirating period in the 1700's, and could give the adventures depth, as the rival families would be like gangs whose fortunes rise and fall with the wars and politics of the times.