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using System;
 
public class Person
{
    public int Id { get; set; }
    //
    public int RelativeId { get; set; }
    public Relative Relative { get; set; }
    //
    public int OtherId { get; set; }
    public Other Other { get; set; }
}    
 
public class Other
{
    public int Id { get; set; }
    //
    public Person Person { get; set; }
}
 
public class Relative
{
    public int Id { get; set; }
	//
    public Person Person { get; set; }
}
 
//============================================//
 
public class CemeteryContext : DbContext
{
    public DbSet<Person> People { get; set; }
    public DbSet<Other> Others { get; set; }
    public DbSet<Relative> Relatives { get; set; }
 
    protected override void OnModelCreating(ModelBuilder mb)
    {
        mb.Entity<Other>()
            .HasOne(o => o.Person)
            .WithOne(p => p.Other)
            .HasForeignKey<Person>(p => p.OtherId);
 
        mb.Entity<Relative>()
            .HasOne(p => p.Person)
            .WithOne(r => r.Relative)
            .HasForeignKey<Person>(r => r.RelativeId);
    }
}

prog.cs(30,32): error CS0246: The type or namespace name `DbContext' could not be found. Are you missing an assembly reference?
prog.cs(32,12): error CS0246: The type or namespace name `DbSet' could not be found. Are you missing an assembly reference?
prog.cs(33,12): error CS0246: The type or namespace name `DbSet' could not be found. Are you missing an assembly reference?
prog.cs(34,12): error CS0246: The type or namespace name `DbSet' could not be found. Are you missing an assembly reference?
prog.cs(36,45): error CS0246: The type or namespace name `ModelBuilder' could not be found. Are you missing an assembly reference?
Compilation failed: 5 error(s), 0 warnings

Standard output is empty