day by day life seems to b vry tough

Changes in behavior can mean a number of different things. It could be they are upset about a recent change in their life or maybe a situation that is going on with their friends. I would talk to them about it and see why they think they have changed. Sometimes changes happen as they get older because their body goes through changes. I would also talk to their teacher or school counselor to see if they have noticed or if they could talk to them. It is important to find out what the changes are coming from to make sure your boys are not doing anything that would alter their moods and to help them if they are having a hard time dealing with a change.