A family office manages the investments, estate planning, and financial affairs of a wealthy family or multiple families. These offices handle a range of services, from investment management to tax planning, philanthropy, and legacy planning. Family offices operate with a long-term perspective, focused on preserving and growing wealth across generations. Major players include Rockefeller Capital Management, Bessemer Trust, and Northern Trust.

https://www.forbes.com/sites/forbesfinancecouncil/2020/10/01/what-is-a-family-office/?sh=1489b3c34fd9