There she was in Washington, D.C., last month when President Obama hosted a powwow with tech honchos at the White House.

Fifteen years earlier, the Facebook COO served as chief of staff to Larry Summers when he was Treasury secretary in the Clinton administration.

And last year, when Summers was being considered to chair the Federal Reserve, Sandberg leaned in to support him.

Sandberg’s mentor didn’t get the Fed job—it went to Janet Yellen. But now it appears that Sandberg will have one degree of separation from the next No. 2 at the Fed. Obama’s choice to be the Fed’s next vice-chairman is Stanley Fischer, whose son David is Sandberg’s longtime deputy.

David Fischer is VP of Advertising and Global Operations at Facebook. Before Sandberg lured him to Facebook in 2010, he spent more than seven years working for her at Google , helping her build a 4,000-employee ad operations group—and taking her job as VP of online sales and operations when she left. Famously thoughtful, calm and unflappable, Fischer first earned Sandberg’s praise when he worked for her at Treasury.

Like son, like father? Apparently. The elder Fischer, whom Sandberg indeed knows, is renowned as a low-key, low-ego, and evenhanded economist—the same rep that Yellen has. Once Ben Bernanke’s thesis adviser at MIT, Stanley Fischer, 70, has been the World Bank’s chief economist, the IMF’s No. 2, a Citigroup vice-chairman, and the head of the Bank of Israel, where he steered the central bank through the 2008 global economic crisis with remarkable finesse.

That’s such an impressive resume that some people doubted that Fischer would agree to be No. 2 at the Fed–but Yellen reportedly pushed the White House to ask him. If he’s confirmed, Fischers father and son will be working for two of the most powerful women in the world.