Since mum died, eight years ago, my sister and I have shared looking after dad. He lives independently and manages remarkably well. We have taken him on holidays, done housework and gardening, taken to hospital appointments etc. Another sister lives in London and did not see dad at all for the first six years but, after being taken to task she has been up to visit for the day on three occasions since. That's the background. Two years ago, dad joined a group for vulnerable, lonely people and met this married woman, who is in her fifties. At first, we thought how nice it was that dad had a friend who would pop in for cups of tea, help with shopping etc as my sister and I live 10 miles away. We have subsequently learned that dad has paid for a holiday for the friend and her husband, paid for a private medical consultation etc. Even worse, though, dad has stopped us taking him to hospital appointments as this woman now accompanies him and we are kept in the dark. I have challenged dad about this woman's motives and have basically been told to mind my own business. I would welcome any thoughts on where we go from here. I am at my wits' end!