Bit of a long one but advice needed.
A few years ago my mother died leaving two teenage children who then went in to the care of my sibling. The father of the youngest two(not on the bc) had disappeared but was abusive when around, tried it on with my sister when she was 13, wanted my sister and I to wear a hijab etc, wanted the female sibling to be circumcised. NC for many years. After mother died a card was sent to the children, we decided to not tell the youngest siblings as we felt they had been through enough (13 at the time of the letter). 2 years ago, his family turned up and his nephew had him on the phone (he is in Iraq) and he was asking my autistic sibling to help him get back in the country. After the family left, we contacted the Police and Social Services/schools etc. The family have not been in contact. The father kept calling me, my sibling (carer of youngest siblings), via phone and on Facebook. We blocked him as the siblings want nothing to do with him. He's now sent a letter via his family in Birmingham asking for help to get a visa to get back in to the country. I'm really worried as his family were told by the Police to keep away and not to get in contact but they are obviously ignoring this warning. Should we go to the Police and make them aware? The letter is full of lies (he was married to our mother when they weren't, he left for so many years because he had Alzheimer's but now he is cured). He has a history of violence towards women and I'm worried that his family might try something. Advice please.