Genetics

@xxnearlyperfectx yeah hair and eye colour works well in a dominant/recessive gene way across the generations. It did in The Sims 2 as well. I noticed that the grey streak in the Alto family gets inherited but I didn't play their family long enough to see if it ever skipped a generation. That one would be really obvious if it did happen.
The facial features such as a bumpy or button nose, or full or thin lips, are the thing I was curious about, especially about if they ever skip a generation, or whether they only get passed down directly to the next generation. In real life I read or hear about aristocratic families boast having a certain chin or something like that. Tess of the D'urbervilles comes to mind, although it is fiction. In my own family there is someone who looks nothing like the parents, but a great-great relative.