users = [{name: "Juan", last_name: "Perez", children: ["Ana", "Pablo"]}, {name: "Martina", last_name: "Juarez", children: nil},
{name: "Marta", last_name: "Juarez", children: []}]

users.each { |user|
	puts "Nombre #{user[:name]}"
	puts "apellido #{user[:last_name]}"
	if(user[:children] != nil && user[:children].size>0 )
		user[:children].each{|p| puts p}
	else
		puts "No tiene hijos"
	end
}