My work has just taken on a new trainee. I've discovered that he is the sibling of a boy who horrendously bullied my son and his friend at school a few years back. It was serious and has scarred my son for life (physical, verbal, racial & sexual with police involvement). The sibling seems OK and I was very friendly and welcoming towards him until I realised who his brother is. I've found myself backing right off and only speak to him if necessary. He doesn't know whose mum I am and I don't intend it to come out which will be easy if I don't get into conversation about where my kids went to school etc.
I know I'm being massively unreasonable as it is not his fault. He is not his brother and may be nothing like him (I'm nothing like my siblings). It was several years ago and perhaps the brother is now a reformed character? However AIBU to feel this way?