Out of curiosity, do we ever actually see our entire family or some of the kids? I have about 20ish right now and i've only seen 1.
The firstborn sons and daughters of Anna, Dora, Moko and now Rebeca can be seen around the house in certain moments. For example, Moko's eldest son has sometimes his gamepad stolen by the eldest daughters of Anna and Dora and he chases them around the house in a futile attempt to get it back (and the father can either turn a blind eye or tell the boy where the lizards went).
And in this current update, Rebeca's son is seen grown up and he will get a gaming console, he'd better keep it somewhere hidden unless he too wants to do some running laps. And atm, the other children that the protagonist has with the other ladies are still babies, perhaps the dev will have them grow up as the story advances further.