This is a major transition period for him and you, as he will be returning home from college for the first time after not having had to answer to his parents for any of his behavior (for at least nine months). Given his senior year summer's drinking/partying/hanging out experience, I would not be surprised if he came home with an even more carefree, hedonistic attitude toward his summer vacation. You did not mention that you had disagreements about his past underage (probably irresponsible) drinking and irresponsible attitude toward work so I would expect that he thinks you tacitly have endorsed/allowed this behavior and will do so again. I think that you may have set yourselves up for some continued irresponsible drinking and job habits through your prior responses.

I would suggest that you do not wait until he comes home this summer to discuss your summer expectations of him as a member of the family. I would extend him understanding based upon his newfound independence as a college student but I would also suggest that you establish some "common courtesy" rules of behavior and family responsibility with him. He should not be using your home, as a hotel and as party central when you are away. If he is under 21, he is still an underage drinker. He can and should participate in sharing household chores and responsibilities. I am a firm believer in all family members' knowing each other's whereabouts and how to contact each other at all times. Discuss your concerns, and rules (always with the reasons and values behind them) in a series of informal conversations and letters before your son returns home.

Anyone who has ever returned to their parents' home after their first year of college can understand how difficult a transition this can be. With mutual understanding, and respect, this summer can be a pleasant reuniting, one that can be looked forward to each and every summer of year.