So my parents separated when I was quite young, my relationship with my dad was always difficult and complicated but I still had regular contact with him growing up. He remarried and had another child when I was about 12, I'd come over to their house quite often, I really wanted to have a close relationship with my sister, I had always wanted a younger sibling because I was the youngest untill then. But it was difficult to do so when I didn't get on very well with my dad and my step mum wasn't keen on me either. They moved abroad a few years later, when my sister was around 7. They came back for christmas, a few months after they had left, during that time my dad and I had an argument, a lot of things had been left unsaid for years so it didn't come as a surprise. I decided after that I would better off not speaking to him, I just couldn't really deal with it anymore. Though I knew going NC with him meant also not speaking to my sister which was really difficult. Many years later I've not contacted them or heard from them since, apart from the occasional update about them from my aunt. Today I found my sister's facebook account I'm tempted to contact her, she's 18 now so it's been a long time, I imagine she remembers me, we were really close back then, I feel terrible for not staying in contact with her. They're back in the UK now too. I just don't know what to say to her or whether I should just leave it all together