I thought we had a good relationship. But I've discovered that my 18 year old DSD has been bad mouthing me to her mum, and saying I am cruel to her (about asking her to help around the house, largely). Her mum has been sending vitriolic texts to DH on the back of this.
I am so cross that I am on the verge of asking them both to move out. I have had enough. AIBU to be upset by this? I am really starting to dislike DSD.