I am probably late to the table with this one, and sorry if it is repeated information, (I just skim the posts while looking for Pinstars’ updates) but you can upload a sim while playing in your house. When you go into CAS (to change outfits or hairstyle) it gives you the option to upload just as it does before you move a sim into town. This would give everyone a chance to see how your generations are changing! I uploaded my 2nd generation heir and plan to do this for every heir/heiress here after. It will be cool to see the change from the original founder.
Oh and IRL red hair is a recessive trait, but so far in my game all my offspring have it! I used my sim self as a founder but didn’t think the red hair would keep being passed down :-/