>If he marries Peggy, what happens to her original husband and
>kids? Everything isn’t happening the way it did before.
>Separate from the stones there’s still a huge buttterfly
>effect caused by him being there which would make things NOT
>progress as they did in the original timeline.

they never showed a picture of her husband or said his name. the only thing she said in the archival footage was that she married a guy who was one of those 1000 guys that were saved by Cap. that could have just been a cover story. even in her TV show she kinda had a couple romantic interests, none of which matched that description. she was married to Cap had kids with him and kept it secret.

there is no butterfly affect. that doesn't apply here. Cap not coming back through the machine and showing up on the park bench as an old man proves that nothing else changed. it couldn't have, otherwise he would not have been there with them.