After Sam and Bucky finishes working on the boat, they went over seas. Sam met a Siren, he fell in love and so did she. They got Married and after Sam became Captain America, he stopped going to see her normally.

Sam still loves her, so he goes out to find her, but he can't. So he keeps going out to find her but nothing, then he sees a girl that looks like her and a little girl? Yes, they have a 5 year old daughter together.

Sam sees her and the little girl, so he decides to walk over.