Comment by Chib_Chubby on The Youngest Has Many Secrets - Chapter 10

I don't know

Yes she was kidnapped and had her soul put in another body by the mage king and thats why she doesn't look like her parents. If you wanna see spoilers on their reaction check below.

This story did a real good job with portraying what losing a child and reuniting with them after so long would actually look like. There was a lot of grief, guilt and anger from both the parents and Rubien. It wasn't a happy reunion/realization you see in other stories. The parents had a hard time accepting it because that meant that for 10 years they were mourning, their daughter was trained/used as a child soldier away from loving parents. Rubien had to endure all those years with no parents and go thru war as a child. 

like the title, Rubien had a lot of secrets and this was the last to be found out. First, that she is a girl, then that she was a mage, then that she was a child soldier that was being chased, and THEN that she was the lost child.
After finding out how hard life was for her the whole family was heartbroken, but then finding out she was kidnapped and your own child? Both parents lost it, and kept thinking if only had gone looking for her. Ruby was mad because she had 2 loving parents this whole time, when she thought she was alone.