With the aristocracy a distant memory and no dramatic religious fervor driving its populace, economic status is the only major legacy to be left for one's descendants. As a result, despite the growth and evolution of their civilization, family and lineage remains a strong pillar of their culture. In the modern world this means that governments cannot stay in power without the support of the various families who have traditionally controlled different sectors of the economy and the lesser families that are part of their power structure. Lumeris society has long been organized around families, clans, and dynasties - a natural outgrowth of the multinational, island-based history of their society.
While infighting and backstabbing occur on a regular base in the interest of vengeance or profits, there is a consensus that the families must coordinate to take on the really big opportunity that is the galaxy. The current leader is Jenestra Omalfi'Meos, voted by the Four Families. Amplitude Studios, a subsidiary of Sega, has a number of 4X games that take place in the same universe, which allows for some deep worldbuilding and flavor text if one cares to read it all. Traditional alignments are the Meos family running farms and agricultural products, the Omokar handling construction and union issues, the Lancellum building ships and ports, and the Arrakyo dealing in politics and legislation. Endless Space 2 lets players take control of various factions, and the United Empire is great for beginners - or those who want to dominate. The Lumeris faction is also known as the Four Families as these four power blocs have been running the society from the shadows for many years.
Their society is organized around a series of families that have traditionally run different parts of their economy, and the balance of power and negotiations between the families is what drives progress - or blocks it. Expansion and acquisition are the bywords of their culture, and as an amphibious people they are prepared to make money in any environment. The Lumeris are a society that revolves around trade, economic deals, economic growth, and doing business.