<human>: Summarize the given text in a few sentences.

I live in quite a nice area with very friendly neighbours. Most of my neighbours have kids who are about 5 or 6, and we also have a few elderly couples. A few doors down, there is a family who have been known, up till now to keep to themselves. 

A few nights ago, one of the elderly women was trying to park her car and found that there was a car in her parking space. So she left her husband, who is going through chemotherapy as we speak, to go ask the owner of the car in her space to move. When she asked the gentleman to move, he started swearing at her and taunting her, telling her that she couldn't do anything about it. When she started waving her handbag around he told her that if she hit him with it, he would punch her. This bought the attention of our street. The situation calmed down after the elderly women gave up and decided to ask a neighbour if she could use their garage for the night.

After all the attention the family had given themselves, I found out that at around 4am, a few people would often congregate around the neighbour's house. They weren't the most friendly looking people, and it was quite clear that they were dealing in illegal substances, they were hardly subtle about this.

Obviously the first port of call would be to tell the police, however, this man lives with his wife and his daughters, one who is 2 and the other who is 7. I'm very worried about them and I am uncertain of how this would effect them. Also, the neighbour may attack back if he is caught by the police. It seems to me that it would be quite obvious if he is caught, he would assume that one of his neighbours would have been the cause, especially with the old women incident a few days ago. Living in a neighbourhood with a lot of children, this really worries me, but at the same time I am unwilling to sit back at let the neighbour create a dangerous environment in a residential area. How should I deal with this situation?
<bot>: Neighbour selling hard drugs and creating an area unsafe for a residential area, but telling the police could also hurt the children. How should I handle this?