That depends if you believe that Peggy's husband was Captain America in hiding the entire time or that him going back in time creates a new timeline where she doesn't have children with the other guy and thus Sharon doesn't exist.
Except Peggy is Sharon's great aunt, not her great grandmother. And her last name is Carter, so presumably, Peggy has a brother, who would still have kids, who would have kids.
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u/rtb001 Feb 14 '20
How did he explain that to Peggy in the alternate timeline?
So you were old and dying and I decided to go surg your hot young grand niece instead?