Romance, Short Story? possibly part of a series for brothers

[Lisbet]

So basically, this girl adopts her nephew as her own after her sister died. The sister was on and off with this guy for a while, but the guy is a womanizer and has got with everyone in town. Btw, it’s a small country town. The guy comes back to town and is attracted to the girl, the one who has the baby. The girl meets the guy’s mom, brother and nephew at a carnival where they see the resemblance between the guy and his son. It end with them together as a family after he proposed. I read it this year, 2019. Would gladly appreciate if someone helped me remember the book cuz it’s been bugging me all day.

[Kris]

Lisbet, is the heroine the older/younger/twin sister? How do the couple earn a living? How old is her nephew now?

How did her sister die? (Spoilers are okay - just give us a clear warning before revealing a spoiler.)

Can we eliminate Rachel Laine by Jennifer Peel? The boy is eight and the sisters are twins.