You do. Nora and Hunter didn't know each other, so Drew and Keira weren't involved with each other since they only met after David got into a relation with Ophelia, at which point, I believe, Annabella had already passed away.
It is true that Nora/Keira (David's family) didn't meet Hunter/Drew (Ophelia's family) until after David/Ophelia hooked up, but Annabelle was still alive at that point. David/Ophelia had Brenna in 1998 which lead to David/Ophelia/Aliza getting a place together. Nora/Keira started having sex with Drew that year (1998), and moved in with Hunter/Annabelle/Drew the following year (1999). Annabelle wouldn't pass away for 3 more years (2002), after which Hunter was "on the market" (so to speak) and joined Drew in having sex with Nora/Keira.
Getting back to the speculation, I'll admit I'm not sure of David's age and have been guessing that he's the same age as Ophelia. This would mean David was a mere 15 when he bought a home, which is surprising but keep in mind that Hunter cosigned the loan and was giving David financial advice.
As for new Annabelle, while I personally doubt David or Drew are her father, either are technically
possible based on the timeline. If original Annabelle is her birth mother, then she's at least 17 years old in the game's present (2019), which would seem to fit with the her youthful air when we meet her in chapter 12. If David or Drew are her father, she wouldn't have been conceived earlier than 1998 when David met Annabelle and when Drew became sexually active, making new Annabelle 21 at the oldest.
I still can't for the life of me understand why Nora and Keira would've shacked up with Hunter. We know he was already heavily scarred/disfigured by that point. I wonder if he was using chemical means back then too?
Keep in mind Hunter presumably had other seduction skills besides the chemicals, and if Hunter was using chemicals on them, Nora and Keira never seemed to figure it out. I guess what happened was after 3 years of getting fucked by Drew, they were so addicted to sex that they would have been more receptive to Hunter?
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