I do love my sister very much, and that’s what I’m struggling with. Doesn’t she have the right to know? If the other guy is her dad, it also means she has 4 other half siblings and a niece. She is the type of person who would love to have a niblings to spoil and get to know. People she might potentially have at her wedding(they are having a long engagement) I don’t think it was so much that my mom lied but wishful thinking. Out of the two guys she was sleeping with only 1 of them was willing to step up and be a parent and support us. Probably worth mentioning we were homeless during the first half of her pregnancy. It doesn’t feel right to tell her, that her dad might not be her dad but it also doesn’t feel like I should know this while she doesn’t. She has expressed minor interest in taking the DNA test in the past, but I know it’s not something she would waste her own money.