Family Tree Bugs my Legacy

I loved the new family tree, but it´s making mistakes, like calling the stepmother's ex as the father of my sim, BUT HE ISN'T! Is there a way to edit relashionships now? Without mods?

The thing is. Jenna is Kado's ex. She got together with Kim Eun-Jae, whom had alredy a daughter called Kim Amelie. There's no father. There never has been. I created both of them only. And now, the family tree list Kado as Amelie's father? WTF? Jenna isn't even her birth mother. She's Amelie's stepmother. Amelie Has nothing to do with Kado. This makes everything WRONG. It's and 4th generation family. Now she's listed as sister of everyone, even her ex. HOW CAN IT BE FIXED?