I have class person,city and street. Number its House number. I was faced with such a problem that a person can live not only in 1 city, but for example in 2 (NY and LA). How add new city to person.

```
var live = new List<Live>();
    lives.Add(new Live
    {
        Person = new Person
        {
            FirstName = "Joe",
            LastName = "Doe"
        },
        City = new City
        {
            Name = "NY",
        },
        Number = 31
    });

```