i didn't have a lot of details for the daughter except she grew up a native and that she has an older brother (someone mentioned bringing him in so his details are tba). her parents were together until she either went off to college or moved out; he would've divorced her mother right after. he definitely was at a point in the relationship by then he was staying together for the kids until they were out of the house so they couldn't resent him, which they probably do now because he's moved on and has a baby on the way with his new girlfriend. it was a surprise to both of them and she would've just found out.
for the ex, i was hoping something where they had dated all throughout high school and married because she got pregnant. it could've just been the way things were and despite their issues they stayed together for the kids. i'm imaging them bickering over little things all the time, but it could be getting to a point they’re being friends again... until she finds out the baby news, she can either take it well or bad and resolve more tension. it'd be fun to play out a divorced couple who just no matter what, despite everything can't adult and be nice. haha.