Ruby ancestor chain fun

gistfile1.rb

module Foo
  def hello
    puts 'foo'
  end
end

module Bar
  def hello
    puts 'bar'
  end
end

module Baz
  def hello
    puts 'baz'
  end
end

class Parent
  include Foo
end

class Child < Parent
  
end

c = Child.new
c.hello # getting 'foo'

Parent.send(:include, Bar)

c = Child.new
c.hello # getting 'bar'

Parent.send(:include, Baz)
c = Child.new
c.hello # getting 'baz'

Parent.send(:include, Foo)
c = Child.new
c.hello # I want 'foo' back

puts Child.ancestors.inspect