Real estate / land. Buy a bunch of condos and rent them out. You have basically infinite passive income (yes those buildings won't be there forever but relative

Real estate / land. Buy a bunch of condos and rent them out. You have basically infinite passive income (yes those buildings won't be there forever but relative to your lifespan it is infinite, probably will provide income for your family for several generations) without having to produce or do any labour / work. There is maintenance / repairs to be done but that can be outsourced to a real estate / concierge service.