how to itterate through items of a multiple select list on related form? help me understand for each with lists

how to itterate through items of a multiple select list on related form? help me understand for each with lists

I have a Child form, with fields Last_Name and first_Name

Parent form has from called Children which is a multiple select list .. picklist to Child form

In Data form, drop down field to select Parent, and a Notes form called listOfChildren to display list of Student names.

 listOfChildren = myParent.Children

gives me a list of Child ID's  like   12234233, 1231342

I need the children's names John Smith, Jane Smith (given that John is First_Name and Smith is Last_Name