Why does my wife sleep with my sons?

You need to figure out why your ex-wife sleeps beside your sons. In this case I think it could be for comfort. Was the reason for your separation hard for her? The separation could have been hard on her and your sons, and it gives her a greater sense of security. Maybe she doesn't want to be lonely. Are they her only children, or the youngest? And why do your sons like to sleep beside her? Maybe for the same reason. They feel more secure and nurtured. In any case, they should be in their own beds. I understand both perspectives because i'm 14, and I have a twin, and whereas I like to sleep by myself, she likes cuddling up against someone, and likes sleeping with my mum. My mum also likes sleeping beside her. You should talk to your sons in a casual conversation. Don't make them feel uncomfortable. Do it while engaging in an activity together. Talk about it. They likely won't turn out like your ex-wifes brother. Why not show them answers to this question? See what they make of it.

I think your wife is damaging your kids. You can possibly take her to court for custody of your kids and cite that reason as the reason. Not sure if that would be a reason in your state that would permit a custody change but you can definitely try. The judge could also possibly order her to be evaluated mentally if you request it. Another option would be to contact your states child protection services department and see if that's something that they get involved in. Its not normal and really is damaging your kids psychologically. Even though it's nothing sexual!

Talk to your sons and tell them it's not normal to be sleeping with their mother at their age. Tell them they have to stand up to their mother no matter how much she screams. When she leaves the house, tell them to make a place to sleep in another room and to not let her go in there to disrupt it. Even if they have to sleep on the floor, they need to do it in another room. Tell them about her brother and where he is in life. Your ex probably won't even let them go off to college to stay in a dorm. When they're 18 offer to let them come and live with you. Start thinking about how to make that possible.

If you have affection with sons and they also reciprocate, you may well persuade them not to sleep with their mom. If they don't accept your advice, better leave them to their mom

Whatever her reason at 15 its not anything good to be sleeping with them.