Big Fun: Brian again, who is chipper and energetic and the only dad with a big belly.
The Bear: Brian, the large bearded Big Beautiful Man of the romantic options.
Be Yourself: A central theme in some of the routes, with the love interest coming to terms with some aspect of their personality that they keep hidden.
For all her drinking and flirting, Mary's never cheated on him, while Joseph has slept with Robert in the past. They rarely speak without arguing in some way, and Joseph admits that a large part of why they're still together is for the kids.
Awful Wedded Life: Joseph and Mary Christiansen, the only married couple in the game, are very obviously unhappy with each other.
Joseph's twins (Christian and Christie) are fraternal, but they are nearly identical in appearance and mannerisms.
Always Identical Twins: Craig's twins (Briar and Hazel) are identical.
Main Character: Craig, do you ever do anything for yourself?
Armor-Piercing Question: You can hit Craig with one during his second date, when trying to convince him to take a camping trip with you: it basically cuts to the heart of the main conflict of his route.
Robert and his daughter are ambiguously tan, with no other definite indicators of ancestry.
Enforced in Amanda, who retains the same physical characteristics regardless of the the ethnicity of the player character (as well as regardless of whether she is your biological or adoptive daughter).
Corsets for men really were in vogue at the time, including over-bust models designed to flatten the chest.
Aluminum Christmas Trees: Damien remarks at one point that he's glad to own period-appropriate binders in the Victorian style.
Actually deconstructed, however - in his good ending, Robert will admit that he's not in a good place emotionally for a relationship despite his mutual attraction with the player character, and resolves to improve his situation first while keeping the possibility of a relationship in the future.
All Girls Want Bad Boys: It's a same-sex relationship, but Robert's route is based around the attraction to the "bad boy" (or bad dad, in this case).
It's okay to like things outside of what people most know you for.
Damien's Ending: Don't let your life be dictated by your 'brand'.
Craig's Ending: It's okay to work hard for other people, but don't forget to take care of yourself.