I imagine them to be a happy family in the modern AU where Fengxian and Lakan are married and Lahan and Maomao are their children. Fengxian would be strict but she very much dotes on her kids (just not as obviously as Lakan, but who can compare with Lakan).
I feel like Lakan would be a lawyer which would put his skills to use, whereas Fengxian would be an academic in mathematics, and of course they're both super good at xiangqi and go in different ways. (I'd like to think Fengxian taught Lahan a lot of maths when he was younger and that encouraged his love for the subject).
Lahan appreciating Jinshi's numbers (while Jinshi is wearing the Imperial armor)
Also Jinshi being weirded out because Lahan is very similar to Maomao(physically and behaviourally) with the difference that Lahan is "attracted" (in a weird La Clan way) to him.