We use a theory here that we can look at the picture in the Images folder of the game that has the heads of the adults. We then locate where the mother and father is, and look for the middle area between them, that's where you'll find how their children will look! I'll put the image in this post so you can see for yourself

Pick one male and one female, then count the heads that are between them on the picture and then cut that number in half and locate the heads in that spot..the child should be one of those in there



Sometimes there are also mutations where you'll get kids that aren't in between the two parents' heads in that image.

Example
Lets say in my game, I adopted the rainbow-haired woman and she married a blonde man. I look at the picture of all the heads and look for the rainbow girl and blonde man. These are circled in purple.


I count how many heads are between them, there are 8..so the middle would be 4. I circled the 4th and 5th head since they are closest in the middle.

The child will likely come out with one of those heads, but it could also be children outside of the green circle. If a child came out that is far away from the purple circles, we call that a mutation.

If you're using the rainbow haired girl and the spikey haired man beside her, the child can come out looking exactly like either of them, or like the heads above or below them.

So if I pair up the blue-haired girl at the bottom with the guy with the mohawk, they can also produce children that are rainbow-haired and spikey o_o

Mohawk man + Multi-shade blue woman
Spikey blue man + Rainbow woman
Mohawk man + Rainbow woman
Spikey blue man + Multi-shade blue woman
Adoption event in game
Random mutation

For a child to look like he/she should be genetically, they'd look like one of the following:

Here is my edited family tree putting all children together. Children with a distinct blue border are twins, black borders are tripets and the green outlines mean mutants!