So this starts when we came to australia. My mom has been talking to this guy for a long time and when i asked who he was she said a close friend of hers. One day when my dad went out of town a day later the guy comes and my mom introduces me to him. So the next morning when i wake up to get breakfast i go downstairs and i see my mom having sex with him on her bed. My friend was with me and he saw what happened. We slowly walked upstairs and he told me that i should tell my dad because my mom is a slut and she doesnt deserve to live with us. Im stuck idk if i should tell my dad or talk to my mom!!