I moved to Scotland 4 years ago and decided to rent out my property.i was approached by a friend and asked if I would consider helping out a single mum in need. She was living in dreadful conditions with two small children and needed out. I met her and she seemed really nice . I said I would help her and let her rent the property. I let her move in with no security deposit, and I left a lot of furniture as she had none. I rent it below market value so she can afford it and advised her I just want her to look after the place and pay the rent and live quietly as it's a nice family neighbourhood. As long as she did these things the.n she had a home for as long as we were away which was going to be long term. Im a good landlord. I am available to her 24/7. I complete repairs and problems within 48hrs in most case and it's only longer if I can't get workman to call. She Is on The whole a good tenant. She pays the rent on time and keeps the house in an ok state ( not my personal standard but each to there own). Since moving in she has asked if 5 boyfriends can move in and each time I have said yes as long as they behave themselves. I won't put them on the tenancy as I feel if there is a problem she is protected and it makes it easier to get them out. When she does not have a boyfriend there we communicate well and have a friendly relationship . When a boyfriend is there this stops and she will only communicate through the boy friend. Recently she asked if another boyfriend could move along with his twin girls. I agreed under the usual agreement. Since he moved in he is a pain. He contacts me at all hours over the most stupid things ( the neighbour has there tv on to aloud and can I ask her to turn it down), if I don't reply in 15 mins he contacts my elderly mum and pours out the problem to her. The most worrying is the neighbours are reporting that the police are there every Saturday night. My question is what can I do. Do I A: leave them to it. It's none if my business b: approach her and say it has to stop or he will have to go c: say it has to stop it she will have to go or d; do it in writing and make it a formal warning ? As there are now 4 small children involved I don't want her to end up in unsuitable situation but I can't have the police at the property all the time. I called the police who advised it was domestic reasons .