At the end of Avengers: Endgame, Chris Evans' Steve Rogers went back in time to return the Infinity Stones that were used to undo the snap, only to remain in the past and marry the love of his life - Peggy Carter. However, rather than this being an alternate reality, Endgame's writers have said that Steve had always been married to Peggy, referencing what we saw in Captain America: The Winter Soldier.
"It is always our intention that he was the father of those two children," Endgame writer Stephen McFeely told The Hollywood Reporter.
In The Winter Soldier, an older Peggy told Steve she had two kids with a husband whom Cap actually saved in World War II. This indicate that she'd moved on when Steve went under ice, although we never found out the identity of the husband and the children.
More importantly, if Steve really is the father, then their kids would have super-soldier blood running in their veins.
It is an interesting notion because if the time travel Steve has two kids with super-soldier ability, Steve has had made a great job of keeping them off-book from S.H.I.E.L.D. Leave your opinion in the comment section below.