Hi my half sister is 13 and she stays with my dad on the weekends. My dad sleeps with lots of different woman has always been a cheat and cheated on my mother and my sisters mum. He's been having a woman stay over every weekend and she leaves her thongs and bra hung up in the bathroom. It's making my sister feel awkward! She found a condom on the floor in my dads room. She went into my dads room at night and they were naked in bed together. I don't really talk to my dad as he's a dick. But any advice I can give my little sister? I feel bad for her x