I have the same problem. I cant play with my own childs, I have to sell them all at the moment. Reinstalled everything and I am playing on a new save file.
Here the corosponding datas from the save file.
First one is one of my normal slaves:
"340":{"children":[],"father":-1,"halfsiblings":[],"id":"340","mother":-1,"name":"Carrie Sagespirit","race":"Dark Elf","sex":"female","siblings":[],"state":"enslaved"}
this is one of my daughters. I sold her because she wasn't working:
"481":{"children":[],"father":"3","halfsiblings":[],"id":"481","mother":"285","name":"Torbanise Pendragon","race":"Elf","sex":"female","siblings":["957","379"],"state":"left"}
I hope this helps some one to help us xD. thx for helping. ^^