There will be three paths, not two. This has been confirmed by the author original novels and MP.
1. Anna will be faithful David, maybe Jake, but no one else will be on this path anymore. David and Anna will have more children or Jake.
2. Anna is insecure and can act slutty; she may or may not cheat. All characters will participate in this path. Anna cheats, David forgives her, and they go to therapy together.. David and Anna will have more children.Maybe Or Anna has children with someone else
3. The slut path will involve all characters except David.Maybe Anna has children with someone else
From observations of other games, it appears that developers use pregnancy at the end of the game, which usually appears in the epilogue with the character in question.