Hello,
By 'broken' meaning when the connecting lines between siblings are not an uninterrupted line, but a sort of disconnected dotted line, and the parents each have their own line leading to the child, without any relationship to each other.
For example, the Broke family (what a coincidence). As you can see in the attachment, all brothers have the same mother and father, but the family tree shows them as half-brothers? :oogle: The Smiths over in Strangetown have the same type of family tree. I've never played that lot before, so I know it's not something I messed up.
I've come across stranger things than this though. At one point, Brandi Broke was listed as the other parent of Samantha Ottomas' twins :smt107 Fortunately, I was able to fix that using the Insimenator's family tree; it was the only time I edited family relationships.
*attached image removed*