ef-core load collection property of nested tph inherited member

Given the following class structure

 public class Parent 
    {
        public Guid Id { get; 
        public List<BaseChild> Children { get; set; }
    }

 public abstract class BaseChild
    {
        public int Id { get; set; }
        public string ChildName { get; set; }
    }

public class NormalChild : BaseChild
    {
         public DateTime BirthDate { get; set; }
    }

public class RichChild : BaseChild
    {
        public List<OffshoreAccount> OffshoreAccounts { get; set; }
    }

public class OffshoreAccount 
    {
        public string AccountNumber { get; set; }
        public AccountInfo AccountInfo { get; set; }
    }

What is the best way to query parent data to include information about the children's offshore accounts?. I came up with the solution below, using ef-core's explicit loading, but it just doesn't feel right. Is there a more elegant solution?

var parent = Context.Set<Parent>()
    .Where(o => o.Id == Guid.Parse(parentId))
    .Include(o => o.Children)
    .SingleOrDefault();

foreach (var child in parent.Children.OfType<RichChild>())
    {
        Context.Entry<RichChild>(child).Collection(f => f.OffshoreAccounts).Load();
        foreach (var account in child.OffshoreAccounts)
            {
                 Context.Entry<OffshoreAccount>(account).Reference(f => f.AccountInfo).Load();
            }
     }