This is my EmployeeInfo Model:
Public partial class EmployeeInfo
{
    
    public int EmployeeInfoId { get; set; }
    public string LastName { get; set; } = null!;
    public string EmailAddress { get; set; } = null!;
    public virtual ICollection<EmergencyInfo> EmergencyInfos { get; } = new List<EmergencyInfo>();
}

public partial class EmergencyInfo
{
    public int EmergencyInfoId { get; set; }
    public int EmployeeInfoId { get; set; }
    [Required]
    public string? LastName { get; set; } = null!;
    [Required]
    public string FirstName { get; set; } = null!;
    [Required]
    public string? Relationship { get; set; }
}

This is what I have in my View:
@model AckPackage.Models.EmployeeInfo
@{
    ViewData["Title"] = "Create";
}
  @if (Model != null && Model.EmergencyInfos != null && Model.EmergencyInfos.ToList().Count > 0)
                {
                    var count = Model.EmergencyInfos.Count;
                    @for (var i = 0; i < count; i++)
                    {
                        <div class="form-group row">
                            <div class="col">
                                <label asp-for="@Model.EmergencyInfos.ToList()[i].LastName" class="control-label"></label>
                                <input name="EmergencyInfos[@i].LastName" value="@(string.IsNullOrEmpty(Model.EmergencyInfos.ToList()[i].LastName)? "": @Model.EmergencyInfos.ToList()[i].LastName)" class="form-control" />
                                <span asp-validation-for="@Model.EmergencyInfos.ToList()[i].LastName" class="text-danger"></span>
                            </div>
</div>
                        <div class="form-group row">
                          <div class="col">
                                <label asp-for="@Model.EmergencyInfos.ToList()[i].EmailAddress" class="control-label"></label>
                                <input name="EmergencyInfos[@i].EmailAddress" value="@(string.IsNullOrEmpty(Model.EmergencyInfos.ToList()[i].EmailAddress)? "": @Model.EmergencyInfos.ToList()[i].EmailAddress)" class="form-control" />
                                <span asp-validation-for="@Model.EmergencyInfos.ToList()[i].EmailAddress" class="text-danger"></span>
                            </div>
                          </div>
}
else
{
                    <div class="form-group row">
                        <div class="col">
                            <label asp-for="@Model.EmergencyInfos.ToList()[0].LastName" class="control-label"></label>
                            <input name="EmergencyInfos[0].LastName" class="form-control" />
                            <span asp-validation-for="@Model.EmergencyInfos.ToList()[0].LastName" class="text-danger"></span>
                        </div>
			   <div class="col-md-6">
                            <label asp-for="@Model.EmergencyInfos.ToList()[0].EmailAddress" class="control-label"></label>
                            <input name="EmergencyInfos[0].EmailAddress" class="form-control" />
                            <span asp-validation-for="@Model.EmergencyInfos.ToList()[0].EmailAddress" class="text-danger"></span>
                        </div>

}

if I change the <input> tag in the else part like this:

  <label asp-for="@Model.EmergencyInfos.ToList()[0].LastName" class="control-label"></label>
 <input asp-for="EmergencyInfos[0].LastName" value="@(string.IsNullOrEmpty(Model.EmergencyInfos.ToList()[0].LastName)? "": @Model.EmergencyInfos.ToList()[0].LastName)" class="form-control" />
  <span asp-validation-for="@Model.EmergencyInfos.ToList()[0].LastName" class="text-danger"></span>


 I get an error. Below is the screen shot.
I am willing to change the Model class because my above code is way too lengthy. 
I have several properties defined in both EmergencyInfo class and EmployeeInfo class.