HABTM messing me up - Rails 3 - ruby-on-rails

Question

I have a simple HABM relationship set up between users and children.
If a child belongs to you, I want you to see the child AND the name of other users that this child object belongs to. For some reason I cannot print the name of the other users the child belongs to.
I select as such:
#children = Child.all(:include => :users, :conditions => ["users.id = ? AND enrolled = ?", current_user.id, true])
and try to print as such:
<% for user in child.users%>
<% if can? :manage, Child %>
<a rel='tipsy'><%= link_to '[#{user.first_and_last_name}]', edit_child_path(child), :title => "#{user.updateChoice}"%></a>
<%else%>
<a rel='tipsy'><%= link_to '[#{user.first_and_last_name}]', new_parentnote_path, :title => "#{user.updateChoice}"%></a>
<%end%>
<%end%>
It selects the right children but DOES NOT print the other users' name. Only the current user's name.
If I select all children Child.all everything works as expected. All names get printed which tells me it is not my authentication system doing something fishy but something else...probably the way I select the children although I tried several ways =(
I am not sure if I am missing something really obvious but this has puzzled me for hours.
Any help is greatly appreciated. Thanks.
EDIT - Add Schema
As requested bellow here is the schema. The relationship is set up fine as far as I can tell. It is just getting multiple users based on current_user that is not happening as explained above. If I use the query above even though the child has multiple users (I see that by doing a child.count) it will only print the current user's name for some reason it is not fetching the other users name that the child belongs to as well.
create_table "children_users", :id => false, :force => true do |t|
t.integer "child_id"
t.integer "user_id"
end
Then I have children.
create_table "children", :force => true do |t|
t.string "first_name"
t.string "last_name"
t.boolean "enrolled", :default => true
t.datetime "unenrolled_datetime"
end
and users
create_table "users", :force => true do |t|
t.string "email"
t.string "encrypted_password"
t.string "first_name"
t.string "last_name"
........ other stuff to reset password etc
end

Answer 1

You're trying to get the children of a user, and at the same time, get all the other parents?
An easy way to list the children of a user and display the parents of each children would be:
#children = current_user.children
<%= #children.each do |child| %>
<h2><%= child.first_name %></h2>
<%= #child.parents.each do |parent| %>
<p><%= parent.first_name %></p>
<% end %>
<% end %>
ps:
in Children model
has_many :children_users
has_many :parents, :through => :children_users, :class_name => "User", :source => :user

Answer 2

I belive it's the condition "users.id = ? ", current_user.id that makes loading only the children of the current_user, and subsequently when you iterate over those the only user there, is current user.
What you probbly want is select based on children.user_id:
#children = Child.where(user_id: current_user.id, enrolled: true).includes(:users)