first things

Datamodels/DatabaseModels/Address.cs

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+using System;
+using Datamodels.Lookups;
+
+namespace Datamodels.DatabaseModels
+{
+    public class Address: IEntityClass
+    {
+        public long Id { get; set; }
+        public string StreetName { get; set; }
+        public int StreetNumber { get; set; }
+        public string Zip { get; set; }
+        public string City { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public DateTime ChangedAt { get; set; }
+        public LookupValue AddressType { get; set; } //something like "Job" or "Private"
+        public Person Person { get; set; }
+    }
+}

Datamodels/DatabaseModels/Communication.cs

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+using System;
+using Datamodels.Lookups;
+
+namespace Datamodels.DatabaseModels
+{
+    public class Communication
+    {
+        public long Id { get; set; }
+        public string CommunicationValue { get; set; } //mobile phone, home phone, job mail, etc.
+        public LookupValue CommunicationType { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public DateTime ChangedAt { get; set; }
+        public Person Person { get; set; }
+    }
+}

Datamodels/DatabaseModels/IEntityClass.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.DatabaseModels
+{
+    public interface IEntityClass
+    {
+    }
+}

Datamodels/DatabaseModels/Person.cs

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+using System;
+using System.Collections.Generic;
+using Datamodels.Lookups;
+
+namespace Datamodels.DatabaseModels
+{
+    public class Person
+    {
+        public long Id { get; set; }
+        public string LastName { get; set; }
+        public string FirstName { get; set; }
+        public DateTime? Birthday { get; set; }
+        public bool IsActive { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public DateTime ChangedAt { get; set; }
+        public LookupValue Gender { get; set; }
+        public List<Address> Addresses { get; set; }
+        public List<Communication> Communications { get; set; }
+    }
+}