Rails 3 Multi Model Form with Multiple new instances of submodel

Question

Hi, I have three models presented in a multi-model form.

class Parent < ActiveRecord::Base
  has_many :children
  accepts_nested_attributes_for :children
end

class Child < ActiveRecord::Base
  belongs_to :parent
  has_many :other_children
  accepts_nested_attributes_for :other_children
end

class OtherChild < ActiveRecord::Base
  belongs_to :child
end

= form_for @parent do |f|
  # fields for parent
  = f.fields_for :children, @parent.children do |cf|
    = cf.fields_for :other_children, @parent.children do |ocf|
      # fields_for other child
    = cf.fields_for :other_children, @parent.children.new do |ocf|
      # fields_for other child

This works except when I duplicate the second set of child fields via jquery. To be more clear, the fields_for with the new other_child model has a create button which trigger some jquery such as $(new_child_form).clone().insertBefore($(new_child_form)) allowing more than one child model to be added in the same form submit. I know I could submit each child form individually via ajax but this is not what I want.

Rails is getting more than one parent[children_attributes][0][other_children_attributes][1] and only seems to use the last one. Any ideas?