Copying access form field data to another fields

I inherited a database, which I have to maintain.. The issue is this: This is a database that stores data on children suffering from some disease. The disease has a high chance of affecting children's sibling also. So we collect information on kid as well as their brother/sister also. When we call a kid's mother, we ask them if they have another kid also. If the mother says yes, the access form pops up a messagebox asking the question: Does the second kid resides at the same address?, and if answered yes, a new subject ID is supposed to be created (the original subject has a preassigned subject ID created based on conditional logic coded into the form), and some details such as subject'sd address etc. are copied over to the next subject ID (the sibling). The Subject ID is the primary key, but is not autonumber. New IDs are created by the following logic:

For new subjects: Forms![frmPrescreenDataEntry]!SubjectID.Value = Forms![frmPrescreenDataEntry]!txtNewFamilyID & "01"
This creates new subjects IDs such as 2201, 2301, 2401 etc.

For siblings of children, following code is being used to create new subject IDs: NextID = DLookup("MaxID", "qryCurrentMaxID") + 1
This creates new subject IDs for siblings such as 2202, 2203,, 2302, 2303 etc.


If it worked fine, then it was perfect. However I am having two errors: First, The address is not being copied over to the next Subject ID (child's sibling), and the Second: If the original subject in question is a pre-existing record (i.e., not a new record), the new subject ID is created without any problems. However if the original subject ID is a new record being created, whenever the siblings question comes up, a blank form comesup, but new Subject ID for the sibling is not created, rather an error message pops up: This primary key cannot contain a null value. After the above error message box pops up, it opens up the VB debugger, with the "Me.AllowAdditions = False" highlighted. So I tried to change False to True. After doing that, the new blank form still comes up, and there is no error message box. But there is no new subject ID (for siblings) either..

Mind it, the second issue happens when the original subject ID in question is a new record (works fine when the original Subject ID is a pre-existing record)... The first issue (address filelds being copied over) never work at all.. This is the complete code used:

Private Sub framePrescreeningOfSibling_AfterUpdate()
 
Dim Msg, Style, Title, Help, Ctxt, Response, MyString
Dim NextID, HomePhone, Address1, Address2, City, State As String
Dim Zip As Variant
 
 
'Calculate the Next Sibling ID for the Family
NextID = DLookup("MaxID", "qryCurrentMaxID") + 1
'MsgBox NextID
 
 
'Store the Current SubjectID's Contact Info
HomePhone = Me.txtHomePhone
Address1 = Me.txtAddress1
Address2 = Me.txtAddress2
City = Me.txtCity
State = Me.cboState
Zip = Me.txtZip
 
'Msgbox Data
Msg = "Does this sibling reside at the same address?"
Style = vbYesNo
Title = "Adding a Sibling"
Help = ""
Ctxt = 1000
 
'Detect a Yes Value and Start a New Record for the Sibling
If Me.framePrescreeningOfSibling.Value = -1 Then
    Response = MsgBox(Msg, Style, Title, Help, Ctxt)
    If Response = vbYes Then
    Me.AllowAdditions = True
    DoCmd.GoToRecord , , acNewRec
    Me.SubjectID.Value = NextID
    'Map Same Conact Data to New Sibling
    Me.txtHomePhone = HomePhone
    Me.txtAddress1 = Address1
    Me.txtAddress2 = Address2
    Me.txtCity = City
    Me.cboState = State
    Me.txtZip = Zip
    Me.txtSource.SetFocus
    Me.AllowAdditions = False
    Else
    Me.AllowAdditions = True
    DoCmd.GoToRecord , , acNewRec
    Me.SubjectID.Value = NextID
    Me.txtSource.SetFocus
    Me.AllowAdditions = False
    End If
End If
 
End Sub

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