In my last legacy I had a family wherein the mother was very dark (dark skin, brown eyes, black hair) and the father was very light (blonde, green eyes) just like yours and I ended up with two kids that had the same coloring as their mother and one that looked just like her dad. (I don't have any pictures of them, unfortunately) But my last family I played ended up having two daughters that look like a pretty even mix between their parents:
(The mother has died of old age recently so I had to snag an old pic of her at her wedding)
https://i.imgur.com/TelIEKl.png
https://i.imgur.com/ZPaheoX.png
And here are their daughters:
https://i.imgur.com/v2dmUJS.png
https://i.imgur.com/dYtpHF1.png
The second daughter pictured has recently married + had a kid with a darker skinned townie. Their toddler looks like he has the same coloration as his dad, which is interesting because his mother is pretty relatively light skinned.
