The Giants promoted Zack Minasian to general manager. He is the brother of Perry Minasian, the general manager of the Angels. They are the first brothers to serve as GMs at the same time:

The 41-year-old Zack Minasian had been the Giants’ vice president of professional scouting since 2022, three years after he joined San Francisco following 14 years with the Milwaukee Brewers.

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During his stint in Milwaukee, Minasian was special adviser for baseball operations, director of professional scouting, manager of minor league scouting, personnel/coordinator of pro scouting and baseball operations assistant.

ESPN.com

Although they both are GMs, Perry outranks Zack. Perry is at the top of the food chain in baseball operations with the Angels, while Zack will answer to Buster Posey.