My daughter and her husband live with us. They have 2 daughters ages 6 months and 18 months who share a room with them. I overheard them having sex this afternoon while their 18 month old daughter was lying in her crib awake. I know she was awake because I heard her talking while the bed making bouncing noises associated with sex was going on. This is a small room and one end of her crib touches their bed. The ends of her crib are not solid but have bars instead which means she can see them and they can see her. I confronted my daughter about this and she admitted her daughter was awake but was not looking at them. While that may be true, she can still hear. My concern is for my granddaughters. Is it illegal for them to have sex while she and/or her younger sister is in the room? I would think at the very least it is not the right thing to do.