His grades are proficient in all areas; he has several friends, and is well liked by his classmates; his relationships with his younger siblings has changed somewhat over the course of the past 6 months - he has become increasingly bossy, and intolerant of their need for attention. He loves and respects both his parents, but will argue with them if he doesn't want to do something.
Hello...sorry for the delay in answering but my internet was down due to the weather. Your grandson is simply going through a little hormonal change as he is soon to be thirteen. Nothing is wrong with him and asking him will only make your grandson angrier. His behavior is completely natural as he enters the teen age years and is nothing to be too concerned about. The positive aspect is that he is doing well at school. To help with his organization at school, just make sure that he writes down all assignments in a planner. His parents should be checking the planner daily to make sure that he keeps up to date with assignments. With regards XXXXX XXXXX messiness, teen age boys are known to become messy for a while. Clothes will soon be thrown all over his bedroom. His bed will probably rarely be made up. Keeping his belongings in order is simply not a priority in his life right now. He is probably more into the social scene or soon will be. Family interactions will take a back seat. Video games will probably consume his life as well along with sports.
As long as he remains respectable to his siblings and parents, continues to do well in school, has open and honest discussions with his parents, relates well with others in and out of the family, then you have absolutely nothing to be worried about. When he does get out of line, make sure that he is being reminded by his parents about acting appropriately and follows through with the correct behavior.
If you need more advice, just ask. Have a great weekend and once again, sorry for the delay.