My mother is really good at recognizing people...
A while after I came here with my family about five years ago, Slphia followed us here. And the woman I saw with my mom once in a while and thought she was mom's friend was actually her disguise.
I couldn't realize that she was in disguise at first sight, probably some kind of magical item helped her.
Anyway, the important thing is not "how" she did it, but "what" she did.
It was not enough that she went to my mother's house to chat with my mother at every chance she got, but she also used my mother's feelings for me and tried to win her favor.
And she succeeded...
Yesterday, she found a way to get my father out of the house by using her role as a maid, and a little after the explosion she went to my mother. My mother thought that her friend had gotten into a lot of trouble because of the things that had happened at the mansion and had come here to be lazy.