I have twin girls who are 4 and a son who is 3 years old- they all have a love hate relationship and constantly fighting /running everywhere/chucking toys/hitting , my process of discipline is time out step (4 mins for the girls and 3 mins for my boy) next stage if they do not listen they go to their room till they have calmed down. when I tell them off they laugh or act as if I dont exist , they continue fighting,helping their selfs to bits and pieces) .. how do you guys discipline any tips or ideas please?