How to add multiple instance of Data class to another class

I have 2 classes similar to the 2 below where a user can have multiple emails, so how would i do this ? Would it be an array like "Private _Email As email()" or a List( of email)
and how to i add new email to the user class ?

Public Class user

Private _Fname As String = ""
Private _Mname As String = ""
Private _Lname As String = ""
Private _Email As ?? 


Public Property Fname As String
Get
Return _Fname
End Get
Set(ByVal Value As String)
_Fname = Value
End Set
End Property

Public Property Mname As String
Get
Return _Mname
End Get
Set(ByVal Value As String)
_Mname = Value
End Set
End Property

Public Property Lname As String
Get
Return _Lname
End Get
Set(ByVal Value As String)
_Lname = Value
End Set
End Property

Public Property Email As String
Get
Return _Email
End Get
Set(ByVal Value As String)
_Email = Value
End Set
End Property


End Class

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Public Class email

Private _Nickname As String = ""
Private _Emailaddress As String = ""
Private _Default As Int32 = "0"


Public Property Nickname As String
Get
Return _Nickname
End Get
Set(ByVal Value As String)
_Nickname = Value
End Set
End Property

Public Property Emailaddress As String
Get
Return _Emailaddress
End Get
Set(ByVal Value As String)
_Emailaddress = Value
End Set
End Property

Public Property Default As Int32
Get
Return _Default
End Get
Set(ByVal Value As Int32)
_Default = Value
End Set
End Property


End Class

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