modules.rb

module A
  def do_something
    puts 'A->do_something'
    super
  end
end

module B
  def do_something
    puts 'B->do_something'
    super
  end
end

module C
  def do_something
    puts 'C->do_something'
    super
  end
end


class Parent
  def do_something
    puts 'Parent->do_something'
  end
end

class Child < Parent
  include A
  include B
  include C
end

p Child.ancestors
# => [Child, C, B, A, Parent, Object, Kernel, BasicObject]


Child.new.do_something
# Output =>
#
# C->do_something
# B->do_something
# A->do_something
# Parent->do_something