Dear Prudence,
My dad died when I was a baby, and I was so excited when my mom met “Dan” when I was five. Dan was amazing and ended up adopting me when I was 10. Dan’s daughter “Sue” was three years older than me and would alternate bullying me or ignoring me. She didn’t want Dan to marry my mom and especially didn’t want him to adopt me. Her mother was extremely toxic and no amount of therapy could fix that. No matter what Dan did, he could not win with Sue. Sue ended up moving with her boyfriend’s family when she was 17 and didn’t bother to contact her father unless she wanted money. Sue spent my childhood insisting I wasn’t anything to her, especially a sister.
As an adult, I can see the reasons for her behavior towards me, but it doesn’t excuse them. Sue recently got back in contact with our family. She wanted to start over. While I was happy for Dan, I had no desire to have a relationship with Sue. She expressed no remorse for her behavior towards me and blamed everything on her mother. Dan gets upset when I refer to Sue as his daughter rather than my sister. I have explained myself until I am blue in the face. I will be civil and friendly towards Sue but I don’t want a sisterly relationship with her. Both my parents are pressuring me to give Sue a chance. How do I get through to them?