Well Step sister.... so long story with quite a bit of back story, my SS is getting married in October, I'm quite a bit older and she is having a 'booze' party with her younger friends and has planned a hotel and spa for us more genteel types which include my step mum (who is 58) and a couple of our slightly older cousins, there's a trip to a pub in the evening, I love my SS she's a lovely lady but unfortunately we live 200 miles apart so mainly text/call/ FaceTime. We all agreed on the place, date and cost, I'm driving down on the Friday which means I'm unfortunately missing my nephews 18th birthday which I'm gutted about. So my AIBU is, I recently found out that my SS's best friend is bringing her 14 year old daughter who looks 11 but acts like she is 25, this 'child' dominates every event she attends as her mum refuses to discipline her and remind her not to be so disrespectful to others, her needs must be met at all times, I'm so upset and feel that this occasion will become the '14 year old show' and I'll miss being with my own 15,17 year old daughters and husbands fun loving family to be with a load of adults who will just appease the14 year old (there's no issue that my own daughters are not invited as they would choose to go to their cousins 18th as they are close and most of their friends are going)..... HELP I know I need to dig deep and find the courage to express how I feel just need to rant first.