I don't know how to feel about this, so I am asking for help. About 3 months ago, my husband caught my then 7 year old niece touching my daughters private parts. My sister and I talked to both girls and explained that this was inappropriate touching and we thought it was settled. This last weekend, my father asked to have the girls over to visit since it is spring break. My husband talked to my daughter about it and she said she did not want to go to Papa's. This is very unusual as she loves him very much. He talked to her and found out that when my niece and daughter were at Papa's, my niece told my daughter she wanted to play "boyfriend and girlfriend" and was laying on top of my daughter and kissing her, and doing humping motions. My father is taking care of my step-mother who is in the final stages of Alzheimer's, and can't watch them every second. I think it happened when they were supposed to be going to bed in the spare room, where there are 2 beds, one for each girl. Now I don't know how to approach my sister because she gets very defensive about the raising of her daughter because she is a single mom. I don't want to cut my niece out of my life either, she is so young still and I don't think she understands the damage she is doing to my daughter. Now my father is very down that my daughter doesn't want to come over to visit, but should I tell him as it happened in his house? I am so conflicted right now because I was molested by my uncle from the ages of 7 to 9 and it has had a life long effect on me. Help!