My ds is 7 and DD1 is 5 and from the time they get up to the time they go to bed they fight and i mean actually fight, they bite, stratch, punch each other, they irrated every each and can' play together, they are contantly trying to beat each other (racing into school, racing to get their clothes on, with 'I'm winning' all the time) then the other get upset and storms off. DD1 has bruises where DS has biten her. I have sat them down and said that they shouldn't fight and they don't see me and DH fighting and biting each other. They also scream and skiek at each other and its getting me down.....