My boyfriend is 43-year-old. His mother and his 20-year-old niece have been visiting for a week. Since the niece arrived, she had slept in the living room and the mother with him. Today my boyfriend tells me that the niece slept in bed last night because the room temperature was better than in the living room. I trust him. But I don't consider it appropriate. I don't want to sound absurd. And I have not seen any conduct that makes me think badly. But our relationship is long distance and I've share with her only once. I didn't like the situation and I told him how I feel. Am I the only one who can feel weird about that situation?